I have not seen destruction of an AR upper receiver like this before. The left side of the upper receiver has been peeled open almost like a banana peel. Marky of Tactical Tshirts condemns the cartridge because it is too easy to mix up ammo and have a catastrophic failure.



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  • anon

    Or you know, pay attention to what you are doing?

    • Thamuze Ulfrsson

      That would be reasonable, don’t expect that from people. Honestly, I check headstamps sometimes.

    • Anon

      It’s really not that hard, I’m just waiting for the day that guns come with a warning telling you to not point it at yourself.

      • Joseph Goins

        They do. It’s in the owner’s manual.

        • Anon

          Oh, right, I forgot about that.

          • Joseph Goins

            You’re like me and just threw it out and started playing with the toy.

          • Anon

            Yep.

        • STFUTWIT

          I don’t need no stinking manual…..lol

      • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

        Yours doesnt?

  • Stevy

    I second that

  • OJS

    So, not a .300 upper?

    • Joseph Goins

      Apparently. The short summary could have been more helpful.

  • Terry Ka’lama Hoeft

    Because its too difficult for some people to have some dedicated mags for 5.56 and some other dedicated mags for .300 blk.

    • Douglas Bohannon

      Why not use colored electrical tape? Cheap and easy; also write the round loaded on the tape.

      • Terry Ka’lama Hoeft

        Exactly it just takes some common sense thinking to differentiate the different magazines. Or to realize that if the difference doesn’t scream “obvious different calibers” that in a high stress environment the human mind will not think twice about the magazine it grabs.

      • Sunshine_Shooter

        There are dozens of ways to keep this from happening, which only furthers the point that the operator of the pictured weapon was not paying attention.

      • Nashvone

        Colored floor plates on different brands of magazines. Different color rifle bag. All kept in a separate safe from my 5.56 AR. Maybe I was paranoid when I bought my .300 BLK.

        • OBlamo Binlyen

          There is no such thing as too much paranoia when it comes to a boom inches from your face.

  • Rick O’Shay

    “Marky of Tactical Tshirts condemns the cartidge.”

    This means what to me? A guy who runs a t-shirt company doesn’t like a certain caliber, and that’s going to do what for me?

    How about pay attention to what you’re shooting. Whether that’s only bringing one caliber out to the range, or reserving/marking your mags and uppers so there’s no confusion, or about a half million other ways to exercise prudence and caution before chambering the wrong ammo…

    • ostiariusalpha

      Marky may condemn, but Darwin approves.

      • Pontificant

        I like to store different rounds in the same magazine, that way I know whatever gun I grab, I’ll have some ammo for it!

        🙂

        • DanGoodShot

          Me too! Lol

        • Mark Are Reynolds Ⓥ

          ROTFLMGO!

        • Jia Li

          Brilliant!

          • disqus_al2dK5yBeS

            …or this.

          • Chad Conroy

            I wonder if he knows he has it in backward. 😉

          • FalconMoose

            Good one!

          • disqus_al2dK5yBeS

            He was reverse compensating for his photog work in front that big shiny thingy. . Sometimes we just get confused.

          • John Giametti

            Don’t think its the mag that’s backward.

            Where can I get a hi cap mag like that for my revolver???

          • sanman99

            Sub HUMAN breed!!!

          • steveindajeep

            haha i instantly said the same thing

        • lyle lorenson

          You Sir, IMHO, Are the Winner of the Inner Nets Today! Well Played!

        • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

          Great plan. Why didn’t I think of it? What other calibers with fit the standard AR mag? Maybe I can carry 3 or 4 other calibers

        • carlcasino

          Yeah I always carry 223 & 5.56 in the same can. I was asked one time why the odd spray paint on some of my magazines. Never a doubt about the ownership of the mag or whats loaded. Factory/ reloaded/Russian etc. Yeah I have more than two magazines.

        • Jack Gamatta

          Must have learned that in college.

          • rooftopvoter

            I am a collige graduwit

          • John Giametti

            From a northern or Calif college with lots of affirmative action students.

          • rooftopvoter

            I graduated from Google University with a Major in Instagram and a Minor in You Tube. Now looking forward to attending classes that offer Pokemon Go.

          • John Giametti

            Ahhh I see said the blind man.

          • Rooftop Voter

            Ahhh I see said the blind man, as he picked up his hammer and saw.
            Sidebar: I took a photo of my new mag configuration. It is 30.06 rounds in a Barrett 50 BMG mag. I call it the 50.06. Tried to load here but it is 2.3 mb in size or something like that and it has to be 2.0 mb to fit. I tried shrinking it but I am really computer challenged and I could not do it. I prayed to the Gods of HP and offered up sacrifices with the ceremonial Hawaiian salt but to no avail. Darn it.

          • John Giametti

            GOOD ONE!!!

          • Outlaw

            That’s funnknee.

        • Striker333

          Lol

        • disqus_al2dK5yBeS

          Some guy in the inner city loads his magazine like this…maybe the rounds can be loaded more easily or possibly it is so the gun is safer. Hmmm

          • Chad Conroy

            I’ll call that and raise you an actual H&K catalogue. Lol

          • CountryBoy

            Yeah, I remember that. They’re still taking grief over it, and of all the people to do it!

        • STFUTWIT

          Apparently from Kent San’s comments, he is already doing this…..LMMFAO

    • nova3930

      Don’t mix mags. My 300 mags are all prominently marked so there’s no confusion in addition to being a different brand of polymer mags than all my others.

      • CS

        Even better:
        If you shoot 300 blk. Buy a dedicated RIFLE for that purpose, paint it a distinct color (RED), paint your METAL mags the same color as the gun, and never swap uppers.

        • nova3930

          That too. My 300 is a super-shorty with a PDW stock.

      • STFUTWIT

        So this t-shirt operator confused .300 BO rounds for .223? How in the banana can a fruit basket do that?

      • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

        You too? Makes it harder to make a mistake.

    • YZAS

      exactly. blame the cartridge, because you messed up. brilliant. maybe he should stick to t-shirts.

      • Marc

        Personally, I blame Hillary. I’m not sure how yet, but I’m pretty certain she’s to blame.

        • Dan

          The plot was detailed in one of the 30,000 emails that went missing

          • Rocketman

            And now she wants an additional tax hike of 1.3 trillion. This no doubt to pay for the government coming in and personally inspecting every magazine to make sure that it meets all new EPA standards for air quality.
            Oh- and the 30,000 e-mails aren’t missing. The NSA has them on file. All of them. Start sweating- Satan in a pantsuit.

          • Striker333

            33,000 emails….that the PATRIOTS at the NSA are slowly leaking. They can read my emails as long as they let me see hers!

        • supergun

          liberals do this kind of things?

        • CompletelyOutsane

          I believe that was a political statement 🙂

        • CommonCents

          hildebeast said it was a vast right wing conspiracy

        • TheCajunRaven

          It was a YouTube video. Yeah, that’s the ticket, Marky of Tactical T Shirts got confused by a YouTube video. And there was sniper fire coming in and the whole thing turned into a big fuster cluck. Yeah, that’s the ticket.

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            Yeah, that’s the ticket

        • carlcasino

          Just wait! in January you will have good reason to want to impeach the SOB’s that had a chance to put her where she belongs, in Prison Striped pant suits. She has already stated what a genius Ginsburg is for her anti 2nd A stance.

        • steveindajeep

          i was going to go with russia but ok hilllary it is!

      • Dan

        I hate t’shirts they are too easy to put on backwards

        • supergun

          Wrong size also?

      • Pavey David

        Isn’t blaming the cartridge for a banana peel like blaming gun for shooting a person. Old t-shirt mark my should do some self reflection or he’ll be printing Hillary for president shirts before long.

      • RCEME

        Yes wrong size T-shirt? must be the fault of the shirt. Of course I did put a LAR 15 mag in my T97 upside down in a speed load & damaged the last hold open. My bad. Bottom line pay attention to what your doing. We tend to get complacent at times and this is what happens. Dudes lucky he still has all his widgets.

    • Stephen Shallberg

      Exactly, my 300 Blackout is only loaded into Pmags with a ranger plate – 5.56 can go in any magazine without a ranger plate – a quick, easy way to tell one magazine from another.
      And I think Marky may be just a joke, he links to Strike Industries JitterPlug for Glock.

    • Kyle

      Dude! Hello, he sells TACTICAL t-shirts. Clearly he is a subject matter expert and tier 1 operator.

      • CompletelyOutsane

        Obviously, we need tighter controls on t-shirt makers! Especially TACTICAL ones.

        • steveindajeep

          we should immediatly implement “tactical t-shirt free” zones! ITS FOR THE CHILDREN

          • CompletelyOutsane

            They pretty much have “tactical t-shirt free” zones at schools now, sadly :0(

        • Chad Conroy

          I wonder if he has a high capacity silk screen. Someone needs to look in to this ASAP

          • Secundius

            If ANY of the Chemicals used in Silk Screening Got into contact with the Re-Loader Propellant, I Agree…

      • hingedthinker

        The author meant to say, “TACTICOOL T-SHIRTS.”

    • Budogunner

      What it means to me is I now know of another company to add to my boycott list. Blaming the very existence of a cartridge for human negligence shows lack of personal responsibility… a very important trait in any gun owner.

      • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

        Stupidity should be painful. I add myself to the boycott. Besides, the shirts are probably printed inside out

      • cnnspy

        That’s the norm in America these days. Always blame the object. It is NEVER the person’s fault. Get busted DUI, blame the alcohol, blame the other guy for getting in the way. Shoot a gun…ban the gun and send all others like it to the crusher. Get fat, blame Mcdonalds for selling unhealthy food. ETC.

    • I second what Rick O’Shay says about the value of a t-shirt company’s opinion.

      There are lots of rounds that are similar in dimensions that can be incorrectly loaded into the wrong firearm. That doesn’t mean they are worth “condemning”. It certainly doesn’t mean Marky of Tactical Tshirts opinion is of any value to anyone, either.

    • bluegreydude4

      You mean the guy couldn’t look at what he was loading in the mag and tell the difference between a .223 and a .308 projectile? Sounds to me like the guy belongs on the rubber gun squad!

      • supergun

        A 223 and a 300 blackout fits in the same mag. They shoot in the same upper. Just the barrel is different.

        • Secundius

          You mean THEY Shoot in the SAME Lower Receiver? The Barrel is in the UPPER Receiver!

          • supergun

            You can use the same lower for the 223/5.56 as well as for the 300 blackout. You can use the same upper, but you have to change out the barrel. All the 300 blackout is, is a 308 in a 223/5.56 casing. 300 similar to the AK 47, but is better.

          • Secundius

            The SAME Lower Receiver can be used on the .50 Beowulf (.500/12.7x42mmR) too…

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            Wow, really? I didn’t know

        • bluegreydude4

          I KNOW that they fit the same mag….I’m trained as a gunsmith! What I said was that the guy should be able to VISUALLY verify that the round is a 5.56 caliber versus a 7.62 caliber! Hell, my 17 year old son can do that!

          • supergun

            You would be surprised at some of the mistakes people make. Look who they voted for the last 7 plus years. It is easy to pick up a magazine and put it into the AR with the wrong bullets, it you are not paying attention. Yes, it is stupid, but it happens. Accidents are part of life.

          • bluegreydude4

            which is why I would mark my magazines….red tape for .223 and white tape for .300 BLK.

          • supergun

            I use tape also. But I also have see-thru Magpul window magazines that I put only one type of bullet in. We usually pay more attention at home to what we are doing, than at the range while the adrenalin is high. Actually tape is ugly and subject to come off. The window mags serve a good purpose when you have both the 300 and 5.56.

          • 1911a145acp

            Tape comes off. Tape feels the same in the dark…..

          • 1911a145acp

            Not in the dark he can’t……

        • STFUTWIT

          So, by what you stated, the cartridges and bullets are the same……have you been to an optometrist lately?

          • supergun

            Before you stick your foot in your mouth again, let me repeat what I said. The 300 blackout is a 308 bullet in a 223/5.56 casing. Both the 300 and 223/5.56 can be used in the same 30 round magazine. Both can be shot out of the lower and upper. But you have to change out the barrels. Now, that is not hard to understand, is it? Another handgun bullet that shares the same casing/shell is the 357 Sig. bullet and the 40 cal. bullet. The Sig. 357 is a 9mm that is fitted into a 40 cal. casing/shell making that 9mm one fast and deadly bullet. You also can use the same magazines and gun to shoot both bullets. You just have to change out the barrels. I have shot many out of my Smith and Wesson M&P 357 with the 40 cal. barrel. Next question?

          • STFUTWIT

            Hmmm…..so the devil is in the details……Guess I hit that nerve….

          • supergun

            Looks like it.

          • Mark Ri

            300 blkout is a .30 caliber bullet. WTF are you talking about .357 and .40 for?

          • Secundius

            30-caliber, ranges from .270 (6.8mm) to .375 (9.5mm). .40 caliber (10mm) is Borderline .30-caliber. For Most People .40-caliber is a Judgement Call, Your Choice…

          • supergun

            When did they release you? I will talk about any gun or bullet I want to. You need to lay off the liquor.

          • Mark Ri

            You are very confused. You must be stoned all the time. I don’t drink or do any drugs and I’ve never been to jail or any sort of institution, except the Navy. Babbling about calibers that have nothing to do with the conversation is moronic.
            I don’t get why some people come on gun forums and act like radical leftist terrorists when they talk to other people.
            300 and 5.56/223 are only similar in the casing. The gun he fired from is MARKED 5.56, so shooting 300 out of it was a bone head move. Only an idiot would make that mistake because people that have a brain, those that have commented the same as I have here, mark their rifles and magazines so as to tell the difference. My rifles look different and have markings, my mags are marked with different color tape. I keep the ammo separate in different ammo cans, when I go to the range i place the guns and ammo and mags in separate firing positions so as to not get them mixed up in case someone else tries to shoot them when I’m not looking.
            This is the kind of conversation normal people have on a gun forum, not going off on people that ask a simple question. Need help? Call someone that can calm you down when you get so nasty.

          • supergun

            You are just a busy body idiot that has more time than you know what to do with. I was just have a conversation explaining to someone who did not know the differences between the 223/5.56 and 300 Blackout. Just for your information: The AR 15 is made to be able to shoot the 223, 5.56, 300 Blackout, 9mm, 50 beowulf, and AK 47 bullets. I was also letting him know that it is possible to shoot 40 cal. bullets and 357 Sigs out of the same platform as long as you change the barrels out in all these examples. You sound like a know~it~all who has angry issues. You should be careful how you handle your guns. You sound dangerous. Quit running to mommy and telling her everything people do.

          • STFUTWIT

            Ooooh, another Kent San…. and you’re not stating anything new…..except for where you digress the topic with the Sig 357 and .40….. However your “analogy” was pretty lame…..now you can pull your foot out of your mouth…..

          • supergun

            You must have been the class clown in elementary school.

          • STFUTWIT

            Oh damn, you got me…..brownie points to you…..lmao.

          • STFUTWIT

            So you haven’t passed beyond the elementary mentality level….well, that explains a lot…..

          • supergun

            I see that you are back. When did they let you out?

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            Not feeling he knows much about firearms. Fanboy?

          • STFUTWIT

            Fanboy? What is that?

        • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

          They may shoot in the same upper ONCE. Ask Banana Peel boy

          • supergun

            They will shoot all day long if you have the right barrel on the upper. You use the same upper for both the 223/5.56 and 300 Blackout. That is the beauty of the AR 15. But you have to change the barrels because the 300 will not shoot out of a 223/5.56. Next question. Do your research before you embarrass yourself again.

        • JoelM

          Yeah but the 223 won’t chamber in the .300. It’s too long. You only have to be careful not to mix them up the other way around.

          • supergun

            Correct me if I am wrong,,,,,but didn’t I just say that. I said the barrel was different. You have to change out the barrel.

          • JoelM

            Sorry I replied to the wrong comment.

          • supergun

            No problem. Thanks. I thought it was another imbecile like that stfutwit dude.

      • Tonewall Jaxon

        300.

        • STFUTWIT

          The 7.62 and the .300 use the same bullet…….but let’s not get technical…..lol

          • Secundius

            And the Overall Length of the 5.56x45Nato is 57.4mm and the .300BLK (7.62×35) is 57mm. So Technically they’ll Fit the Same Magazine…

          • STFUTWIT

            Seriously…..who would have thanked it……hmmm

          • Secundius

            Seriously….the .223Rem, the 5.56×45 and the 7.62×35 are approximately the SAME SIZE in Length. The Feed Mechanism DOESN’T KNOW the Difference. It JUST “WON’T” Chamber “THE” Round…

          • 1911a145acp

            300 BLK with 100 grn and many 110 grn short, light bullets will definitely chamber in many 5.56mm NATO chambers

          • Secundius

            I prefer my 98k Mauser, which can chamber up to 8x60mmS or Arisaka Type 99…

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            But what happened when you pull the trigger?

          • 1911a145acp

            I did not pull the trigger. I was demonstrating that the load would chamber enough for the f-pin to hit it. One unfortunate shooter on our range loaded a 147 grn FMJ 300 BLK round into a 5.56mm gun and banged on the fwd assist until it closed. Pulled the trigger and blew his gun and mag up- very similar to the photo, except his pelled left and right.

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            My point is just because you can chamber something doesn’t mean it’s a good idea to give the trigger a pull. I didn’t really understand your above post, thanks for explaining.

          • STFUTWIT

            So you’re talking about the length of the loaded casing, then technically yes, but girth, no…..unless you’re thinking of comparing the 22-250 with that Russian round. At a glimps there are some similarities.

          • Secundius

            Case Girth? or Base Rim Girth?

          • STFUTWIT

            Both

          • Secundius

            Every Feed Mechanism that I’m Familiar with, Grabs by the Base Rim, NOT by the Cartridge Case…

          • STFUTWIT

            True….but most are pushed into position by the bolt….then engages the rim base once seated in the camber…..but what are trying to get at? This seems to digress from the .300 BO that is basically a trimmed down .223 casing. That in a nutshell is how I’ve seen them reloaded….

          • Secundius

            There are Belt Feed Conversion Kits in Lieu of a Magazine. Pretty Hard to Grab the Cartridge while its Firmly Seated in the Belt…

          • 1911a145acp

            7.62x51mm ( NATO ) and 7.62x35mm (300 BLK ) CAN use the same projectile. 7.62x39mm Soviet and 7.62x54R do not……..to get technical…..

          • Secundius

            As I recall, Both Soviet types are actually 7.92…

          • STFUTWIT

            Tomato, tomauto……

          • 1911a145acp

            Not tomauto. ,308 projectile and .311 projectile…..

          • STFUTWIT

            ? Wtf is a .311???

          • Secundius

            An 8mm (7.89mm) Mauser Round!

          • STFUTWIT

            Cool, learned something new….thanks. Wasn’t that round designed just before or during WW1?

          • Secundius

            About 1888 for the original Patrone M/88 (Conical-Point) and Approximately 1900 for the SpitzgeschoB (Spitzer-Point)…

        • bluegreydude4

          I KNOW it’s a .300 Blackout but the bullet diameter is .308…..read a technical manual on reloading the round if you don’t believe me!

      • Secundius

        IF You’ve NEVER Shot a Weapon Before, AND NEVER Seen Either a 5.56×45 or a .300BLK Before. I Guess You Could Be Excused For Being A “Shallow Ender of the Gene Poole Society”…

        • bluegreydude4

          Not only have I fired a weapon before I have fired MANY weapons before. I am a qualified gunsmith and have been raised around weapons all my life. So who is at the shallow end of the gene pool now? At least I knew who my father was!

          • Secundius

            You Actually Didn’t Comprehend the Meaning? Did You SIR. My Guess the “T-Shirt” Guy Bought a Box of ammo because Visually “TO HIM” it Looked the Same. I Also Was a Armorer in the US Army in the ’70’s, and Worked on Attack Helicopters…

      • Mike Lashewitz

        This is a color coding problem. A nomenclature failure. New laws need to be put in place to prevent this from happening. Buns and bullets need to be color coded so we can be even more tacticool.

        Liberal Thinking 101

    • Brianbrown28us

      Funny thing is, is the lower was marked “5.56” not “multi cal.”. So he needs to pay more attention to what he is doing… Needs to go back to or get some training before going out to the range again.

      • Jon Hammett

        Lower markings don’t mean a thing if you have changed your upper. You do realize that 300 blk uses all 556 components except for the barrel right?

        • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

          But it could be confusing to Tshirts makers

      • Mike Lashewitz

        An expensive learning experience.

    • Mark Ri

      I have 300 and 5.56 rifles. I have red tape on my 5.56/223 mags and black tape on my 300 mags. My 5.56 rifle has a quad rail and white markings, my 300 upper (and it’s own lower) have a quad rail and a barrel shroud so it looks a bit like a honey badger.
      I know the difference and I mark them so they are easy to distinguish. If you put the wrong round in the wrong gun, it’s because you’re a dumb ass.

      • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

        Winner

    • J D

      Was it a re-load or factory ammo?
      I’m not saying re-loads are bad but operator error could cause a gun malfunction. Barrel blockage could cause it.

      • STFUTWIT

        Depends….hot loads are a big risk and so is loading the wrong powder…..these factors might have been the catalyst….

    • Peace-full-one

      2nd that

  • Joseph Goins

    This is why I have magazines for different rounds and I do not deviate from this at all:

    GI mags: M193
    Black-color Magpul: M855
    Tan-color Magpul: match grade 5.56
    Green-color Magpul: self-defense 5.56
    Clear Lancer: 300BLK supersonic
    Smoke-tinted Lancer magazines: 300BLK subsonic
    Hexmags: 458 SOCOM

    • Douglas Bohannon

      Joseph Goins >>>That is an excellent idea!

    • ReadyorNot

      Yup, simple and effective

    • mrsatyre

      Going to be getting my first 300 later this year, and this is a great idea!

      • Sunshine_Shooter

        A good idea from below: 5.56 upper is FDE, 5.56 in FDE mags. .300BLK upper is black, .300BLK in black mags.

        • 1911a145acp

          All my 300 Blk mags are 30 round Black windowed P- mags w/ Ranger base plates, look and feel diff from all other calibers. At one point I had rifles and AR pistols in 5.56mm, 300 BLK, 6.5 Grendel, 6.8 SPC, and 6.5/223. Narrowed it down quite a bit. Now AR platforms in 5.56mm,300 BLK, 7.62x40mm Wilson, and 24-45 Sharps. Haven’t come up with a marking system for the Sharps mags yet but I really like 87 grn bullets at near 3000 fps factory ammo for $21 a box.

      • Fox Hunter

        get a mini-14 in 300 blk. no chance of a mixup there.

    • Stephen Shallberg

      Great idea in any well-lit area area, but in the dark…

      • Joseph Goins

        There are tactile differences between each brand. 5.56 is GI and Magpul, 300BLK is Lancer, and .458 SOCOM is Hexmag. They are all stored separately. Therefore, there is no possibility of mistaking the bullet size or type of round even in the dark.

        But let’s be real: too many people go out and take “nightfighter” and “streetfighter” classes that have no real reason to simply because they are preparing for SHTF, revolution, Red Dawn, etc. The only time I will ever use my rifle is in home defense, and I know my home like the back of my hand.

        • Stephen Shallberg

          Aside from the range I will only use my rifle for the same. I’m a bit on the old side however, and in dim light I have a hard time being certain of FDE, green, gray, or black. Maybe I’m overly cautious, but I know that the presence or absence of a ranger plate is something I can be certain of.

          There is nothing at all wrong with your system because it works for you. For me, I just wouldn’t be comfortable with it.

          • Joseph Goins

            While I haven’t had the best of luck with ranger plates, you can certainly do that. However, it seems like you may not be planning appropriately if those are your concerns. (No offense intended.)

            The only guns my wife and I have that are not in a safe are one AR-15 and two Glock 19s. I have five green home defense magazines that are in a bag with pistol mags, ear protection, medical gear, flashlights, and zip-ties. The bag is strapped around the rifle specifically so I won’t mess up. All of our other magazines and ammo are in a different safe.

            If you keep your ammo truly separate (e.g. different shelf in your closet), you wouldn’t need to rely on buying extra gear. You can also do “battlefield preparation” during the day to make sure that it is ready in low light conditions.

          • Budogunner

            There is also grip tape. That could be a cheap tactile reminder.

          • OBlamo Binlyen

            I use a narrow strip Yellow Duct Tape wrapped around the bottom of the mag. It can be felt and seen. It’s ugly but so is a split upper and/or face.

        • 1911a145acp

          “The only time I will ever use my rifle is in home defense, and I know my home like the back of my hand.” Well that settles it.

      • CTMCSTCSFA

        I’m I don’t know about you but I can tell the difference between a 5.56 and a 30 cal Bullet by feel and weight. So in the dark I can feel that the 300 blk projectile is WAY bigger than a 223/556. So in a well lit area you have to be completely negligent to load the wrong ammo.

        • Stephen Shallberg

          Well, 300 BLK uses the same case as 5.56, but widened to hold a .30 caliber bullet, so at most points along its length a 300 BLK case is not bigger, nor is it smaller, but EXACTLY the same size as a 5.56 case.
          I’m impressed that you are tactilely superior to myself and the vast majority of we regular people.
          And if you carefully read my post you’ll see that I was speaking of differentiating MAGAZINES, not cartridges, in “the dark,” and not in not “well-lit areas.”

          • CTMCSTCSFA

            Well as a surgical PA my sense of touch is crucial so yes I do have a very sensitive touch. As to magazines I’ll give you that but I don’t keep my magazines with 300 blk and 5.56 in the same place for just that reason. I am also going to start using the suggestion of different mag types for the two, USGI for 5.56 and Magpul for 300, or vice versa.
            Again the case is exactly the same length and the base diameter is the same, but the neck and bullet are significantly larger.
            Test yourself. Put six each 5.56 and 300 blk on a table together. Close your eyes and mix em up. Keeping your eyes closed see if you can sort them. Bet you can.

          • Stephen Shallberg

            You’re probably right, but if I’m in a situation where I have to sort 5.56 cartridges from 300BLK in the dark, then I’ve miscalculated in a major way.
            As I posted previously, I have preloaded magazines at the ready – 300BLK in any magazine with a ranger plate, and 5.56 in any magazine without a ranger plate. Your idea of USGI for one caliber and Magpul (polymer) for another is a sound one also.

          • CTMCSTCSFA

            Just a little fun. Shoot straight be safe

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            Haha, my wife is a Pharmacist and she wears a Tshirts saying “You can’t fix stupid, But you can medicate it.”

          • 1911a145acp

            Thankful for your heightened sense of touch. In the dark, in the cold, with gloves on, in a hurry…….Bet you can’t.

          • CTMCSTCSFA

            With thick winter gloves nope. With thin gloves been there done that in the dark,cold winter in Michigan at about 0430 dropped my ammo bag with my and my partners ammo. Didn’t want a light to scare off anything so I had to pull off my gloves and dig out the ammo from the snow. Was able to sort by touch until fingers got numb. Warmed them then finished just in time for a shot. My peter got the deer cause I was still cleaning my ammo off.

      • bluegreydude4

        Good point….I would recommend using some sort of colored tape at the lower area of the mag. Each color corresponds to a different caliber…or for those who are not too quick on the uptake, stick to one caliber!

        • Joseph Goins

          Right. In the dark…where I operate all the time.

          That is why you separate your magazines in the day time so you don’t have to worry about it when an intruder breaks into your house at night. Put the home defense mags (green PMAGs) in a bag attached to your loaded rifle, and store the rest of the. If I go through more than five rifle mags defending my family/home, s**t will have truly hit the fan.

          Moreover, the 300BLK mags feel different than 5.56 mags and the 300BLK mags weigh more than 5.56 mags.

          In conclusion: darkness is a not an issue.

      • STFUTWIT

        Well, guess this rules you out as a t-shirt operator…..

    • notalima

      How does your .458 run with the Hexmags? I haven’t tried those for 458 yet.

      • Joseph Goins

        No issues. Only shot about 250 rounds of them. That is about 30ish mags worth.

      • 1911a145acp

        I hear our friends in CA are running 5.56mm 30 rnd AR mags and possesing a 458 SoCOM upper claiming IT only holds 10 rounds of 458 ammo. That’s thinking outside the box in Commiefornia!

    • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

      Wow, what a system! Thanks for sharing

  • This is a weak post with a dramatic pic. Was this caused by shooting .300 BLK ammo in a 5,56 rifle? Is it a .300 BLK rifle with some other cartridge in the magazine?

    Looks like the lower may still be usable.

    • Rob

      Looks like a stress fracture in the lower just behind the front takedown pin. Toast.

  • go4it

    Solution: If someone has both 5.56 x45 and .300 Blackout Upper halves, DEDICATE SOME MAGAZINES TO .300 BLACKOUT, NOTHING ELSE!

    Color-code the Upper and Magazines together – a simple piece of small electrical or duct tape is sufficient. I even have yellow magazine followers / feed plates in my 300 Blackout “Hex” mags. I then have a stripe of yellow paint on the .300 Blackout barrel. I don’t care what it looks like … Besides, can easily remove it.

    Whatever works …. Anything to prevent the catastrophic damage as shown above, right?

    • Rick O’Shay

      My 300BLK upper is black. The 300blk mags are black. The 5.56 upper is FDE. The 5.56 mags are FDE. Pretty simple.

      • Sunshine_Shooter

        I’m also a fan of “Blackout = black”.

        • Rick O’Shay

          Yeah, that was the thought process behind that color scheme. You’d have to be an idiot to not understand it, but I’m sure there’s an idiot out there itching to prove me wrong.

          • Sunshine_Shooter

            There is always an idiot out there.

      • OBlamo Binlyen

        Can you see the colors in the dark? I’ve got triplets, 2 ‘girls’ with red dots, the ‘boy’ has a scope and is the 300. 300 mags have a strip of yellow duct tape wrapped around them on the bottom.

        • Rick O’Shay

          Whichever upper is on the gun in the safe, is what mags are available in the safe with it. All the rest are in locked up ammo boxes.

  • Joseph Smith

    Would increasing the OAL length of .300BLK to 45MM prevent the bolt from closing on a .300BLK round in a 5.56MM chamber?

    I recall the reason .357MAG is artificially longer than necessary; to prevent confusion with .38SPC (while allowing the reverse, which doesn’t apply here).

    • ostiariusalpha

      “OAL length”… c’mon.

      • Joseph Smith

        How so?
        You couldn’t cut 5.56MM brass but at least you wouldn’t kaboom your gun.

        • ostiariusalpha

          In order for a .308 projectile loaded in a 45mm long case to fit within an AR-15 mag, the bullet would have to be so stubby that you’d be reduced to using <100gr pistol bullets exclusively. Ain't nobody got time for that!

          • Joseph Smith

            New mags then?

            Wouldn’t that help solve the problem?

          • ostiariusalpha

            That would require an entirely new rifle (that doesn’t currently exist), which defeats the purpose of having AR-15 compatibility.

            From a 10″ barrel:

          • Anon

            If the magazine doesn’t fit in the magwell, game over, it doesn’t work.

          • Joseph Smith

            That’s not what… Ah geeze, I give up.

          • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

            How about pay attention? That solves the problem for the rest of us so far.
            I have few collector pieces in 38 Auto and a several of 1911s in 38 Super. I never have had a problem there and except for the head stamp, all the FMJ rounds look the same. If it’s an JHP, I know it’s a 38Super but I look at the head stamp anyway? How do I know. The only 38 Auto ammo I have is ball. And I have quite shooting the collector guns because I am down to 1,000 factory rounds. I do reload but I have not run a lot of 38 Auto in a decade. I do have boxes of bullets and brass.
            But my point is that this is not the first time you need to pay attention. 9mm NATO vs 9mm Luger?

        • STFUTWIT

          Do you reload your own ammo?

      • JumpIf NotZero

        But what about the Overall OAL Length?

    • Joseph Goins

      Are you really trying to be serious?

    • Sunshine_Shooter

      Making the round too long to chamber in a 5.56 chamber would make it too long to fit in an AR magazine, which would have to be too long to fit in a standard AR lower. Your solution would destroy the parts compatibility that makes the cartridge so attractive.

      .357 MAG was never meant to be shot out of .38spl guns, whereas .300BLK was made to do just that.

      • valorius

        attractive to the 10 people that own a .300 blk out apparently. 😉 LOL

      • Joseph Smith

        “whereas .300BLK was made to do just that” See above pic.

        And I’m not talking about longer than the mag.

    • ffr5155

      I must be missing something.

      My understanding is that a .300BLK is nothing more than 5.56 case with a .300″ diameter bullet. The upper is identical to a standard 5.56 AR-15 except the barrel itself. Same magazine, bolt, bolt carrier, etc…

      So, how was a .300BLK even chambered into a 5.56 barrel? Wouldn’t the diameter of the 5.56 chamber at the cases neck prevent that?

      If the opposite happened (5.56 chambered into a .300BLK barrel) I would think it wouldn’t build pressure and just rattle it’s way out of the barrel?

      • Cymond

        Yes, the bullet is bigger, but the case is shorter, and with a narrow tip/lightweight bullet, the overall profile is close enough to the neck/shoulder of standard 223.
        http://www.ammoland.com/wp-content/uploads/2014/02/300-aac-blackout-vs-223.jpg

        • ffr5155

          Thanks for the explanation. I see it now.

        • valorius

          looks almost like someone copied WWII german 7.92x33mm ammo and called it a new invention.

          Kinda amazing that round will even chamber in a 5.56mm barreled gun.

          • McThag

            .300 Whisper was quite old when .300 AAC Blackout changed the dimensions ever so slightly.

            The correct analogy to 7.92 kurz is 7.62×1.5″, a shortened full power round with the same head and caliber as the parent.

            It’s not amazing that it chambers in 5.56 at all. Up to the shoulder, .300 BLK is identical to 5.56 and since that shoulder is way back from 5.56’s, the case fits no problem. Then if you have a weak crimp on the bullet (or pound the forward assist), it can set back to the 5.56 shoulder and NOW you have a problem.

          • valorius

            Seems like an overlooked design flaw, quite honestly.

          • OBlamo Binlyen

            Not a flaw, just not idiot proof. Paranoia is your friend when you have both calibers.

          • valorius

            Agreed, you definitely want to remain very vigilant so you dont blow up your gun or face from a simple mistake.

  • valorius

    I don’t see any point at all to .300 blk out.

    • YZAS

      Oh boy, that’s not a brilliant statement. Because you don’t see it, doesn’t mean it’s not there. If you don’t see it, then move on and forget about it. And no, I’m not going to get in a back and forth with trying to explain ‘it’. If you have to ask, you’ll never know…

      • valorius

        Isn’t the idea behind commenting that you want to have a “back and forth” discussion, or do you just want to hear yourself talk? 😀

        • YZAS

          Neither. That would be a non-sequitur. Add that to your previous empty hyperbolic comment and you basically have nothing to say, and no capability to understand what anyone else is TELLING you. You bore me. Go find a 12 year old to bicker with.

          • valorius

            “I call that bold talk from a one eyed fat man.”

            Oh, and by the way….It’s only bickering if you respond. Genius 🙂

    • Joseph Goins

      It has four big selling points:

      1) With an 8″ barrel, 300BLK has more energy than 5.56x45MM shot out of a 16″ barrel.

      2) With a 16″barrel, 300BLK has comparable energy to 7.63x39MM shot out of a 16″ barrel.

      3) 300BLK is much quieter suppressed than other comparable calibers.

      4) 300BLK is legal for hunting large game in most states. (Most states require a diameter of .240 to hunt deer and the like.)

      • BillC

        Don’t bother. He f’king does this on every 300BO post.

        • valorius

          Dont read my posts BillC.
          -Signed, BillC

        • Kent San

          He’s a moron.

      • Schmoe

        1 a) Out of that same short barrel (un-suppressed), 300 Blk has much less blast and concussion, and much better external and terminal ballistics than the aforementioned 5.56×45, thus making it an excellent cartridge for a SBR optimized for CQB – albeit at a premium cost per round (unless said user reloads of course).

      • valorius

        Muzzle energy all on it’s own doesn’t really mean very much.

        It seems to me that if you hunt, .30-30 is a better choice (sadly, my state doesn’t even allow semi auto rifles for hunting). And if you want a tactical round, 7.62x39mm is pretty much exactly the same…but far more prolific and cheaper. For suppressed applications, IMO, .45acp is a better choice.

        But hey, it’s America, you dont “need a good reason” to own any particular caliber or weapon..and im just fine with that. 🙂

        • Stephen Shallberg

          7.62×39 is cheaper ammo, but you can build a 300 BLK AR upper for a lot cheaper than a 7.62×39…and you don’t have to do anything at all to the lower. It’s a very versatile round for the AR owner.

          • valorius

            I just found out Ruger is making it’s mini-30 in .300 black out now. That is kind of a neat combo. I’ve never been impressed by the accuracy of 7.62x39mm in that particular rifle- the .300 black out mini-14 could be a neat-o hunting rifle in semi-auto legal hunting states (That wont get the elmer fudds all in a tizzy. The old timer guys i hunt with would whine like old women if i showed up to hunting camp with a “black rifle.”)

        • Cymond

          Yeah yeah yeah

          • valorius

            It twitched….HIT IT AGAIN!

    • BillC

      Oh Joy. You’re back here to bemoan the blackout. Pound sand. We all know you hate it.

      • valorius

        I dont hate it, i just dont see any point at all to the round. None. In fact, less than none.

        But hey, if you like it. 😀 😀

        • Sunshine_Shooter

          Really? Less than none? I’ve never seen so much hyperbole in my life!

          • valorius

            But how long have you been looking for a lot of hyperbole in your life? 😀

          • Sunshine_Shooter

            Literally since before I’ve been born.

          • valorius

            I’m your huckleberry. 😉

      • valorius

        BTW, im a BillC too 😀

      • valorius

        I sent my disqus commenting privileges permit application to you, you should get it in a few days. Since you seem to think you have some say in the content of my posts, i figured you were the proper authority to send my application to.

        (that was a real high brow way of saying …well, you know :))

    • Anon

      Oh, this again? If I’m getting tired of you saying this, as someone who’s not a huge fan of the round, you’re saying it too much.

      • valorius

        Actually, i just saw a neat .300 black out application about 5 minutes ago, and came right back here to say so…. Ruger is coming out (or has recently come out) with a mini-14 in .300 black out.

        And dude, you don’t have to respond to me, you know that right. 😉

        • Anon

          We’re not psychic.

          • valorius

            Read the whole post troop.

          • Anon

            I did, it’s called “I disregarded the last part”.

          • valorius

            Well then sir, your problem is not that you’re not psychic, it’s that you’re ignorant 😀

          • Anon

            Okay, Michael Jackson.

          • valorius

            Wish i had his bank account. 🙂

        • STFUTWIT

          Wonder how that platform will work vs the AR one….

          • valorius

            I’ve had a couple mini-14’s (3 i think, over the years) All three were extremely reliable with factory mags. Accuracy was acceptable with all of them.

          • STFUTWIT

            Cool, I’m saving up for a M-14A1….one badass battle-proven platform

          • Secundius

            Norinco make a Clone Copy of the M14S called the M305 in 7.62x51NATO for about ~$650.00 USD…

          • STFUTWIT

            Well, I meant the M1A….is that M305 any good? I know the M1A,not the M305

          • Secundius

            The Stock is Polymer in Construction, but Actual Receiver is an Exact Copy of the M14 Scout Design…

          • STFUTWIT

            Really hard to beat that Springfield action…..a bulletproof design

          • Secundius

            The Mauser Model 1898, IS a “Bulletproof” Action Too! And IT’S 118-years old. Or the Colt Model 1873 Single Action “Peacemaker”, and it’s 143-years old…

          • valorius

            No, cant say i do. The M-14/21/25 (civilian M1A) is a fantastic rifle.

    • CommonSense23

      Well stop looking at the round from a civilian point and look at it from a military one. It makes a lot of sense.

      • BillC

        The dude’s a troll. All he has to do is say something hollow or open-ended about 300Blk, we bite, then he just responds with more empty replies (see above) or with just “.45 or 7.62×39”. Then he just pretends to be high and mighty, and then re-responds with “I don’t see the point of 300Blk” again. It isn’t even an argument about whether 300Blk is best/better/theanswer, just his empty trolling of “it shouldn’t exist because he doesn’t see at point.”

        We should stop feeding him, because the odds of his bridge collapsing on him are probably slim.

      • valorius

        I am ex infantry.

        • CommonSense23

          And that means what?

          • valorius

            I’ll let you ponder that on your own for a while.

        • Kent San

          That means current moron.

          • valorius

            Hyperbole, how refreshing.

          • Kent San

            Thanks for posting stupid sh*t about what you think of the round rather than an intelligent comment, but I guess that’s asking too much of you. Clown.

          • STFUTWIT

            There ya go again….talking chit….you definitely need breath mints boy….

  • David Rogers

    No… no it is not too hard to mix up the caliber. All you do is look at it then look at you gun. Do they match? No? Then put the mag down and pick up the other one and check that one.

    • Paul B.

      There is just no substitute for paying close attention to what you are doing. And this can happen with other guns/calibers too. I read once of a shooter who was badly injured when shooting a .270 rifle. He had also brought along .308 ammo and wasn’t vigilant about verifying what ammo he was loading into what rifle. Since both calibers are based on the same parent case and the .308 is shorter than the .270 you can guess what happened . . .

      • valorius

        (All) people make mistakes. For most of us, we’re lucky in that the mistakes we make don’t kill us.

      • Jako

        I’m guessing you mean a .243 rather than a .270.

        The .270 is derived from the .30-06, while the .243 is derived from the .308, which was derived from the .300 Savage.

  • Oaf

    Well, Mikey from Operator Pants highly recommends the 300blk, so… there’s that.

  • TheNotoriousIUD

    Meanwhile, Jimbo from “Jimbos Tactical Bath Fixtures” thinks its great.

    • Cory C

      Hahaha.

  • Sunshine_Shooter

    .223 and .300BLK are like guns and whiskey. Separately they are great but when you mix the two bad things happen.

  • Konflict7993

    People should really label their uppers.

    • valorius

      to prevent a problem that never existed before some genius came up with a niche round that will blow up a 5.56mm AR if errantly chambered.

      Just buy an STG-44 repro (GORGEOUS WEAPONS, btw!) or AK and call it a day instead of trying to reinvent the wheel.

  • Joseph Goins

    No one takes a gun out without me or my wife present. Problem solved.

  • Bill

    Condemning the cartridge is like blaming the gas pump when you fill your Camaro with diesel.

    • 6.5x55Swedish

      Yeah because most people change their car from being a petrol driven car to diesel and then back again several times a month…

      • Bill

        I’ve got both, and have to keep 2-stroke premix on hand for chainsaws.

      • Twilight sparkle

        you know I’ve always liked the spare upper thing, but it never works for me, uppers turn into spare guns

        • Anon

          Not that it’s a bad thing by any means…

        • valorius

          Agreed. To me an upper is an incomplete rifle.

          • STFUTWIT

            Funny how incomplete some of these “firearm experts” are with their comments, lacking in every way, their grandiose “expert knowledge”….then insult ya when you question them…..LMMFAO

        • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

          Yep. They look so lonely by themselves

      • Joseph Goins

        My personal vehicle is gas. My ambulance (when I actually volunteered) was diesel. I’d be lying if I said I hadn’t filled up the ambulance twice with gasoline. Those repairs were expensive.

        • valorius

          LOL, i’ll bet 😀

        • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

          When I bought this house I had the owner throw a Kybuto tractor that I thought was gas… Ok, I assumed it was gas. Made that mistake once but caught it before it did any damage. I did have to drain the fuel tank . And I replaced the filters just in case.
          Different kind of mistake than picking the wrong caliber.
          I have never done it to a diesel rental car. Not yet at least

          • Nashvone

            I went to high school with a guy that was low on gas while he was out on a date. He stopped by his dad’s construction company to fill up. His car ran on diesel until he shut it off. It never started again.

    • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

      Hahaha
      I put gas in my diesel tractor that came with the house. Damn, what a stupid move. Though I did realize when I was putting the cap back and saw the big “D” in a circle. Never owned a diesel before and thank God I only had to drain the gas … er, ah diesel tank.
      I never blamed my stupidity on the tractor. But I did curse myself awhile

  • Cymond

    “Marky of Tactical Tshirts condemns the cartridge because” of his own, human error.

    Aren’t most gun owners against blaming inanimate objects for human behavior?

    • Joseph Goins

      Try telling Military Arms Channel that when he talked about Tex Grebner’s mishap.

  • Maybe I’m missing something… If it was a “300 BLK AR” like the title said, what round was he firing that did this? A .223/5.56 won’t chamber in my 300 BLK, but if it did it shouldn’t cause a kaboom. The bullet should just rattle down the barrel.

    Maybe if the case got stuck if/when it chambered??

    • Joseph Goins

      The gun is 5.56x45MM. The user tried to load it with 300BLK. It was an out of battery detonation because the round wouldn’t fit in the chamber.

      • That makes sense, but I probably would have titled it differently. Something like “300 BLK BANANNA PEELS .223 AR”.

  • Nocternus

    It doesn’t matter how good your magazine management system is because when you take your 5.56 and 300 Blackout to the range your buddy you brought with you doesn’t know your magazine management system. I had almost talked myself into a 300 Blackout pistol for my next build but now I am thinking 7.62×39 may be a better choice for me. Keeps me from breaking my no Bastard Caliber rule as well.

    • valorius

      I see a lot of people trying to explain away a potentially extremely dangerous situation with “my mag sorting system will never fail”

      Last guy I heard of that was infallible got crucified over 2000 years ago.

      • Kent San

        Well, if you’re stupid it’s best you don’t try. You could have gotten the same results from a full powered round following a squib round you didn’t notice. If you want infallibility you’d best find another hobby.

        • valorius

          Well I guess you never make mistakes. Mind if we call you Jesus?

          • Kent San

            Please do.

          • valorius

            OK, but just so you know, it will be code for “Douche bag.” 😀

          • STFUTWIT

            I second that….LMMFAO

      • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

        Yeah, but he came back from the grave 3 days later. Doing think anyone here is going to repeat that

    • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

      Yep, confusing calibers and bringing get a friend do not mix

  • Nero

    What a joke. 300 and 223 look nothing alike. Has this clown even seen the projectiles next to each other?
    Why doesn’t he just not bring both uppers or just not be an idiot and since he’s not in combat he could just check the gd mag before inserting it.

    • Kent San

      You’re assuming someone this stupid even bothered to look. The rounds fit into a 5.56mm magazine and the magazine fits into a 300BLK or 5.56mm rifle mag well. You have to mark the mags and the mag well, especially on a range day when you are shooting both calibers.

  • Kivaari

    It’s a good reason to own a separate rifle in each caliber. Forget changing uppers. Build a new rifle with FDE furniture for one caliber along with magazines and build another one in black or green OD with matching magazines. If you can afford to play with a .300 BLK, than just buy a complete gun.

  • Frank Grimes

    I avoid this by loading all of my AR-15 mags with 5.56mm ammo and not shooting silly fad calibers.

    • Kent San

      I’m always pleased to see stupid people know their limitations.

      • STFUTWIT

        So, you’re just a smart-ass douche with everyone, awesome. Now STFU TWIT.

      • Frank Grimes

        Uh oh, somebody is upset I criticized their trendy Kardashian caliber.

  • Joseph Goins

    I like grab and go gear. I don’t want to have to jump out of bed wearing my boxers shorts and fumble around while trying to find a few magazines (not to mention the right magazines). All I want to do is: grab my rifle, grab the bag attached to rifle, secure my family, call the police, and stay alive. Anything extra I have to do hurts my mission. (It’s the same reason why you should have a light already attached to the rifle instead of trying to put one on in the middle of the night.)

    I can’t think of ay gun guy that doesn’t have an extra Maxpedition or Condor bag around the house. I just used one of them, some magazines I already owned, some medical gear that I had floating around, and my old EDC flashlight. It didn’t cost me anything. The only thing I had to purchase were flexcuffs (high quality zip-ties specifically made to restrain people).

    I see home defense as the adult version of Home Alone. The better we plan to take down bad guys equates to a higher likely hood of success.

    Flexcuffs: https://www . amazon . com/Safariland-Restraints-Double-Disposable-Handcuffs/dp/B005A2XB9A

  • JoshCalle

    I am 100% sure I have seen this picture before on TFB.
    EDIT: my bad it was on the military arms channel’s blog.

  • Arie Heath

    My .300 Blackout has a band around the stock signifying the caliber. I also have my magazines clearly marked with tape when I go to the range, so I don’t have this unfortunate accident.

    • UCSPanther

      The same approach that Britain and Canada did with their stocks of m1917 rifles during WWII.

  • Swarf

    Oh okay. Well if Marky the T-shirt guy says so, that settles it then, I guess.

    Shut down the machines, boys.

  • FarmerB

    They build 7.62 x 39 in California?

  • Dale Dimick

    5.56/7.62×39/7.62×51 No mix up problems.

  • mazkact

    Speaking as the proprietor of Boudreaux’s Tactical Boudin I say check your head stamp before loading and only use cases with the proper head stamp for caliber.

  • jerry young

    We teach concealed carry classes and part of that is knowing what ammo your gun takes and making sure you use the right ammo, it is up to you as the firearm owner to ensure you have the correct ammo, just because one round is similar to another doesn’t mean you can or should try to shoot it in a gun not designed for it, it is your responsibility!

  • Al Wise

    Nice half-assed reporting. What happened? .300 in a 5.56, or other way round? And we’re now blaming inanimate for making mistakes? What next? Blaming guns for murders?

  • Pedenzo

    The best safety in the world is between your ears….uh….ok, I guess that explains what happened here…..never mind…..

  • Sermon 7.62

    AR15.

    It is interesting to observe the effect of suggestion that marketing and advertising has on the opinions of mind-controlled populace, like appreciation of something as cheap and tasteless as these aluminum kiddie rifles.

    • Anon

      Would you just stop being a failed troll already?

      “Aluminum kiddie rifles”, really?

      • Sermon 7.62

        Beacuse it feels like that, kid!

        • Anon

          You never explained what’s not to like about the AR-15, and I don’t accept “cheap and tasteless” as an answer, as the former is a good quality, and the latter is entirely subjective. Oh, and lightweight rifles are great too.

          Enlighten us as to why we’re a “mind-controlled populace” for liking the AR-15, which is a great rifle platform.

          • Sermon 7.62

            Look at the photo. Is that a great rifle platform?

          • Anon

            …That was caused by some idiot who mistakenly loaded .300 Blackout into a 5.56 gun, that wasn’t caused by any fault of the rifle, because the entire thing could’ve been avoided if they bothered to check what ammo they were loading into the rifle.

            I’m pretty sure that if you tried to do that with a 5.56 AK, it would blow up too.

            What’s next, are you going to tell us that 9mm pistols suck because you can mistakenly try to load .40 in them?

          • Sermon 7.62

            It can’t happen to AK. Because AK is indeed a great rifle platform. AR is a cheap aluminum piece of crap.

          • Anon

            Go ahead, show us a video of you doing the same thing, I think you may be disappointed in your “AK superiority”, and there are instances of AKs blowing up on video.

            If it’s a machine, it can fail, and the AK is not an exception to that rule, no matter how emotionally attached you are to that rifle.

          • Sermon 7.62

            It is not possible to do it. But even if it was possible, then AK wouldn’t blow up. AK is made of heat treated steel, kid.

          • Anon

            Keep telling yourself that, because I happen to know that the AK is not immune to catastrophic failures like you seem to have the false belief that they are.

            Go ahead, fire a round with an obstructed bore/squib load, and we’ll see just how amazing your “heat-treated steel” really is.

            Also, the AR-15 isn’t a “cheap aluminum piece of crap”, because 7075-T6 isn’t crappy by any means. Are Glocks crappy too because they’re “plastic”?

          • Sermon 7.62

            Kid, go catch a Pokemon.

          • Anon

            You didn’t address anything I said, ad hominem isn’t an argument. And I don’t play Pokémon, and I am an adult.
            Have you actually used an AK or AR for all of your talk of how great the AK is compared to the AR?

          • Leigh Rich

            TROLL ATTACK

          • Leigh Rich

            lol WHAT A TROLL

  • Why did you link “Marky of Tactical Tshirts” to a Strike Industries product for a Glock?

    Does Marky approve of your idiocy?

  • valorius

    Since i obviously upset a lot of you .300 black out guys with my comments, let me say i found a REALLY cool .300 black out application- you can now get BEAUTIFUL Stg-44 reproductions in .300 black out. (as well as 5.56mm, 7.62x39mm, and 7.92x33mm)

    Now THAT would be cool!!!

  • Jimmy

    Before pulling the trigger on a 300BLK, I ALWAYS check the bore from the muzzle-end to be certain it’s not a .223 bore.

    • Sermon 7.62

      That’s because 300 Blackout is a great caliber similar to 7.62×39 but much better. It has added capabilities, like the option of using the same AR15 magazines, isn’t it a great and practical solution, in fact, a genius one?

      • Leigh Rich

        Just your opinion kid.

  • jamezb

    Was there a story here or just one boom-pic and a one sentence tagline?

  • CruisingTroll

    I’d wager that the upper receiver isn’t the only thing that exploded.
    A T-shirt isn’t the tactical underclothing needed….

  • Mystick

    Especially considering the receiver is incorrectly marked for that caliber.

    • Kent San

      Well, only about 95% of people put 300BLK uppers on existing 5.56mm AR lowers. That’s the appeal. Of course, nothing trumps stupid. 5.56 ammo and 300 BLK ammo fit the same mags too of course, so a little attention to detail is required.

  • Fox Hunter

    Easy solution, sell all your 556 ar-15s, if all your remaining ar-15s are .300 blk, then no problem, or sell all your .300 blk ar-15s, stick with 556 ar-15s, then get a mini -14 in 300 blk, problem solved.

  • Leigh Rich

    Has to be ammo related.

    • Kent San

      It’s stupid related.

  • Secundius

    The Last time I Saw Something Like THIS, was Due to a Double and/or Triple Load of a Cartridge. I Hope to God THIS Was A Bench Test and Not a LIVE Test…

  • HAHA73

    Oh Marky… it doesn’t hurt when you wear a tactical tee!

  • Trapman

    Nobody has asked whether someone got seriously injured. It can’t be much fun when you have an out of battery incident.

  • ron53

    What the hell is a Tactical Tshirt ? I clicked on the link and it wanted to sell me a part to stop Glock rattle .

    • Secundius

      If I had to Venture a Guess? The Ones with Pockets under the Armpits to Holster Your Gun. Like the Ones Cabela’s Sells made by Hatch…

  • Simon R.

    If he doesnt like paying attention he souldnt be shooting in the first place. Tool.

  • Mark Are Reynolds Ⓥ

    Someone explain to me how a 5.56 round fired in a 300 blackout is going to cause this? First off, if the bolt locks on the cartridge and is able to be fired, the round is going to be way UNDER PRESSURE due to the fact that the bullet doesn’t even come close to fitting in the barrel. The bullet will make it out the barrel and fall to the ground a few feet away. The rest of the powder is going to burn outside the barrel and there would be no way in hell for it to do this! I’ll tell you what happened…WRONG POWDER for the cartridge. Or possibly a spontaneous detonation caused by the wrong primer. This was a way over pressure scenario not a way under pressure one. Now, IF someone managed to chamber a 300 blackout round in a 5.56…yes, this very well could be the end result.

    • Secundius

      Reverse Wording? Not a 5.56 from a .300BLK! But a .300BLK from a 5.56…

    • Kent San

      Boy are you mixed up.

  • QueenAnnesRevenge

    I personally Mark my 300blkout cartridges with dykem layout fluid so that it shows through the pmag window and use an ejection port cover on the blkout upper marking caliber. If I’m shooting 5.56 and see a marked case, then obviously an error has occurred. It also makes the cases look different enough that someone unfamiliar with multical usually will ask a question. But you can only mitigate error, $h!t happens, I still see people driving down the street and they obviously put diesel in there unleaded cars. All falls down to training. Shooters got to pay attention to their tools.

  • Old Vet

    Simple is as simple does…..I use P-mags for my .300 and Colt’s for 5.56…..easy enough to remember, even for an old guy like me.

    • Secundius

      As I Recall, TEN .50 Beowulf rounds can be placed into a Standard 5.56x45mm/Nato 30-Round Magazine. STILL Doesn’t Mean that a 5.56 AR Rifle will Chamber the Round…

      • Kent San

        What happens, especially with non-cannelure ammunition, is that the bullet gets pushed back into the casing and the round gets chambered. Of course, the 30 cal bullet isn’t going anywhere and the pressure has to go somewhere.

  • Matt

    It’s not a 300 Blk AR. It’s a 5.56 hence why it blew up.

  • MJ

    Just send me the remains of the rifle as-is and I’ll dispose of that pesky EOTech sight which assuredly caused this mishap.

  • CJS3

    Too easy to mix up calibers? Man that’s tough. Why blame a caliber for an operator error?

  • BigFED

    My question is “HOW”??? How did a .300BLK round ever fit into the 5.56×45 chamber? The bolt should NOT have gone into battery when trying to seat a .30 caliber round into a 5.56 chamber! I can see seating a 5.56×45 in a .300BLK gun, but not the other way around! There has to be more and it involves some serious headspace problems, both with the rifle AND the SHOOTER!

    • Kent San

      What happens is a round without a cannelure can get the bullet pushed into the casing and thus chambered.

      • BigFED

        As gunsmith for over 35 years, I am well versed on how things work. That STILL leaves the question of how one chambers a .300BLK CALIBER round in a 5.56/.223×45 chamber enough to allow the action to go into battery. One could NOT take even an empty .300BLK case and chamber it in a 5.56 chamber without having to force it closed and something not being READILY noticeable!

        • Kent San

          Ironically, I watched a rerun earlier this week of the TACTV episode on the 300BLK with Larry Vickers and someone from AAC (developers) where they shared a caution about precisely what happened here. It was the first time I heard the line that a cannelure may grip the bullet enough to keep the rifle from going into battery. The developer said: “I know of no serious injuries, just some cuts and bruised egos, but nothing much is salvageable from the rifle.

    • BigFED

      I found a better analogy posted by “supergun” using the .357SIG and the .40SW. One can easily chamber/fire the .357SIG in a gun chambered for the .40SW. BUT, the .40SW round WILL NOT FIT IN THE CHAMBER MUCH LESS ALLOW THE SLIDE TO GO INTO BATTERY!!!

  • CJ Klekar

    Somebody please explain or detail the background on this story…one opinion of a Marky T-shirt does NOT add relevance to a Ka-boom. I’ve been shooting .300 BLK for years now without any failures. As with anything that has the potential to cause harm or death, ATTENTION TO DETAIL IS YOUR PRIMARY FOCUS!

  • Kent San

    Just because the owner is a moron the cartridge is bad?

    I found plastic / polymer bands labels 300BLK that I put on the magazine well and on magazines with 300 BLK ammo. I also color code magazines with that ammo. Red for supersonic, green for 150 gr ball and black for subsonic. I brief all my friends shooting with me that no magazine with a band gets inserted into a well without a band and vice versa. No problem.

    • Secundius

      If the Person is a Reloader, and did a Propellant Substitution from a Recommended RL-17 to an RL-19 or Higher. That Could Conceivably Blow the Rifle or Compressing a RL-17 Propellant could do it too. The Color Coding on a Polymer Bullet is a IP Rating, RED has a IP-67 Rating for “6” protected Against Dust and “7” For Immersion in Water up to 1-meter Deep for 30-minutes…

      • Kent San

        The person was an inattentive moron that tried to load a 30 cal bullet in a 22 cal barrel. The powder lecture is irrelevant.

        • Secundius

          WE KNOW the Caliber of the Lower Receiver as Being 5.56x45mm/NATO! But WHAT’S the Caliber of the Upper Receiver? Unless you have “Superman Vision” and can Clearly See Through the Barrel? The Barrel is the UNKNOWN Link in the Story…

          • Kent San

            There really is not a caliber associated with an AR lower even though you see it marked 5.56mm. Agree the story is nebulous, but the incident is obvious. The owner has done what 1000s have done and purchased a 300BLK upper. The magazines, bolt, bolt carrier are all compatible with the 5.56mm, only the barrel differs. He took a magazine full of 300BLK and carelessly failed to realize his 5.56m upper was on the lower. Again, ignore the etching. it’s just for the BATFE on the model and caliber originally sold, it does not really mean anything special and isn’t unique. A host for a 458 SOCOM upper is also a standard AR lower. In many, maybe most cases, chambering the larger round would have generated suspicion. In fact, the bolt may not have engaged the lugs. But as can happen, especially with bullets lack a cannelure, the force of the bolt closing on the bullet, pushes the round deeper into the casing and the rifle can go into battery. He then fires the rifle. The 30 cal bullet is not going to travel down the 22 cal barrel and the pressure grows in the chamber. Following the path of least resistance, it blows the receiver apart as you can see in the picture. The posting then asserts the 300BLK is a bad caliber because an idiot can do this.

            As mentioned by hundreds here, you have to “mistake proof” this by marking the upper and the mags if you have 5.56mm ammo and uppers around in order to ensure 5.56mm and 300BLK ammo and equipment don’t get mixed.

          • Secundius

            If you BOTHERED to Actually Read the Literature of the Alexander Arms .50 Beowulf. It was Specifically Designed to USE the 5.56x45mmR/NATO Lower Receiver and the 5.56x45mmR/NATO Magazine. Would I use a .50BMG Upper Receiver on a 5.56×45 Lower Receiver? “HELL NO”! Not with ALMOST 11.3 TIMES the Recoil Energy produced by the 5.56…

          • Kent San

            What are you trying to say? Do you even know?

            You just made my point, the lowers are compatible between the 5.56mm and 300BLK. The 300BLK is specifically designed for a 5.56mm lower AND uses the same bolt and bolt carrier too. IF YOU bothered to read the literature, you’d know a 300BLK has less pressure than a 5.56mm? Recoil energy? Do you know ANYTHING??!!! Do a basic internet search and stop posting nonsense.

          • Secundius

            They Say a Picture Is “Worth A Thousand Words”? In this Case Maybe 500 Words. You KNOW What the Lower Receiver IS! You “DON’T” Know What the Upper Receiver IS! You’re ASSUMING the Upper Receiver is the SAME As the Lower…

          • Kent San

            I DO KNOW the article is titled “3OOBLK Banana Peeled” and that the caption says: Marky of Tactical Tshirts condemns the cartridge because it is too easy to mix up ammo and have a catastrophic failure.

            Is this still an f-ing mystery to you??!!!

            Using your retarded logic, Superman did it with X-Ray vision.

          • Secundius

            I guess you haven’t gotten around to reading ALL THE COMMENTS? But My Original Comment, Suggests a “Catastrophic Failure” Due to a Possible Overloading of the Propellant Charge! Either by Double or Tripling the Propellant Charge…

          • Kent San

            If it was, the title would Double Powder Charge Banana Peeled Rifle.”

            Reading is fundamental.

          • Secundius

            But It Doesn’t? Does It!

          • Kent San

            No, it doesn’t so why are your opining that it might have been the cause.

            I’m done. You argue with all the skills of a 5 year old.

          • Secundius

            Please Point Out Where in Either the Title or Underlying Comment, that it Even Suggest a “Double Charge”…

          • Kent San

            I get it now. I actually thought you were that stupid for awhile. I’m being dragged from the baseball game and off to dinner. It’s always best not to underestimate stupidity on the internet, so you got me,

          • Kent San

            It just dawned on me that English isn’t your primary language. Forgive my terse tone.

          • Secundius

            How Many Website Have YOU Been Own Sir? The First Thing You’ll Notice is That Virtually Nobody can Spell for SH|T or make a Coherent Sentencing Structure. I’ve Seen Comments Posting In “Klingon”, “Leetspeak”, Latin, Chinese, and those Stupid Characters with the Happy Faces, Frowning Faces and EVERYTHING In Between…

          • Kent San

            “Been Own” (sic)? So you’re no more stupid than the average web poster? Congrats.

          • Secundius

            YOU “STILL” DIDN’T COMPREHEND THE COMMENT MADE! I was Comparing the .50BMG with the 5.56×45, NOT THE “.300BLK”…

          • Kent San

            And WTF does that have to do with this??

          • Secundius

            Probably because you were Eventually Going to Segway in that Direction. By Stating that they Make a .50BMG Upper Receiver to “FIT” a 5.56×45 Lower Receiver…

          • Kent San

            The internet, no IQ test required for use. I think you’re the only person posting in this thread that missed what happened. Congrats. You’re “special.”

  • Dan Hermann

    Since I have many AR’s in different calibers I mark the dust cover in silver paint. .300blk, 6.5 gren, etc. When the dust cover is open there is no mistake as to what caliber it is.

    • Kent San

      If that works for you. I prefer to color code magazines and mag wells. Disagree that all people will note the difference in 300BLK ammo through the opening in the receiver.

  • CompletelyOutsane

    ALL cartridges caliber are clearly marked. Don’t blame others, or objects, for your screw-up. Own it and learn from it.

    • Kent San

      You make the obvious point, but in fairness, you really should “mistake proof” this situation. If a magazine can be inserted and the bullet can be forced back into the casing thus allowing the chamber to close, you’re going to blow the rifle apart.

      I think the 300BLK is great and have a 300BLK SBR and a 16″ barreled upper that fits on it and other 5.56mm rifle lowers. You just color code or use some other method to avoid this issue. So I agree, but do believe basic safety precautions make sense, especially when 5.56mm / 300BLK rifles and ammo are in the same vicinity.

      • CompletelyOutsane

        There are many methods, but the underlying issue is that it is the end user who is responsible for success or failure in the situation. You and I are not in disagreement.

        • Kent San

          Concur. Aside from the ass clowns here trashing 300BLK as THE problem, the germane point most are making is responsible firearms use is mandatory. As you say, there were/are many ways to avoid this mishap. The headline of the story and the conclusion made are both asinine.

  • David Christensen

    My 223/5.56 guns & mags are black…. Other calibers & mags are different colors – the .300 Blk is FDE, The 6.5 is FDE & brown Kryptic. The mags and doors are also well marked with the proper caliber. The AR versatility is great, but you MUST be careful!

  • Doug Wicker

    Thanks, Obama ! ! !

    Sorry, but I simply had to beat everyone to the punch on that one. ;o)

  • TRUBOOST

    I will openly say that 300blk is one of those calibers i just dont understand. It isnt really good at anything….. but to each his own. i also have been the victim of ammo mix up. somehow a steel case .223 round made its way into my AK ammo can. the round loaded into an AK mag, fed, and fired with a tiny little pffttt noise. no harm was done but it did take a lot of pounding to get the stuck case out. it swelled horribly and split down one side. i am much more cautious now. i am still not sure how it happened. i always keep my calibers is seperate cans.

  • glenn cheney

    Well, today is August 6th, 2016…..G*D BLESS THE 509TH. They knew the difference between a Little Boy and a Fat Man, one actually was a rifled armed “cartridge.”
    FWIW, The pilot’s relative of the Aug. 9th’s mission was recently presented with a custom, s.s. comp. muzzle braked, s.s. gas blocked/tubed, s.s. 416R .223 Wylde match grade bbl., billet upper, enhanced chg. handle, and nitrided BCG, and may go NiB. F.F. bronze ultra-slim rail…..Her VFW has a tank, but she’s the only one that knows how to run it.
    For those ready to hit the gong, she shoots .45 long colt. Her backup is The Judge…..She can slice n’ dice the mil-spec inventory part by part with the numbers…Zeeze, we got a lot of under-utilized expertise in the hoof out there.
    As for 300 AAC, have friends that are totally into it…suppressed/can, sbr, NFA, ATF, yadda yadda….He can run n’ gun…I’m just a wannabe geezer….I’m dumping all of my 300’s, half of my 7.62×39’s.
    Working a bunch of 6.5 grendels, just began two 7.62×51’s…..this ought to be fun playing parts compatibility game.
    If that ain’t enough, then we got over in Lakeland, Fl. America’s first female combat vet. She’s a real deal GUNNY!
    Bless all who served, be thankful we have the ability to gather, muse, and argue over what it is, what it should be, what it could be, and what it will be.
    My inventory by caliber is 6.5 meenie greenie, 7.62×39, 300 AAC, 5.56/.223/Wylde, and now starting 7.62×51.
    We own only “hunting ammo.” 300 getting the boot over ammo cost/availability, no I do not care to reload. All have 416r s.s. match bbls. Bye, bye.

  • Mac

    Pretty expensive screw up. There are no excuses for this kind of negligence.

  • J. gM

    The whole idea of being able to switch uppers for use on the same AR-15 lower receiver is just opening the door for putting in the wrong ammo. Even having two complete AR-15’s in different calibers is asking for trouble. Basic safe handling calls for checking the caliber designation on the ammo box matches the caliber inscribed on the barrel of the gun – at least the caliber is marked and visible in the ejection port of most handguns. Does an AR-15 upper clearly show the caliber ?

    Yes, the shooter put in the wrong ammo and his expensive gun is ruined. Just how much of assistance did the gun itself provide to make the mistake obvious ?

    The blast does not appear to have been directed primarily towards the shooter’s face, rendering blows up less hazardous, a good design feature.

  • Tonewall Jaxon

    you have to truly not be paying attention or an idiot to do this….my eyeballs can see the difference very clearly ..if YOU LOOK…….first mark the mags PLAINLY or used different mags….keep each cal. with that particular gun…….put down the weed or beer and PAY ATTENTION……..marky ..stick to 223.

  • Russian Roulette dont Tweet

    Since this has turned into a tshirt thread I will weigh in.

    I own Russian Roulette Clothing and I blame the shoulder thing that goes up. I also blame the ghost guns that shoot 30 cal magazine clips in 1/2 second and the bullet button which turns AR-15s into fully automatic.

    Oh and thanks Obama. #mattv2099forPresident.

    One more thing, this shirt will turn you into a god damn sexual tyrannosaurus. Just like me. Buy one.

    • Christian Green

      I also blame the shoulder thing that goes up… and my favorite color is bakelite.

  • Tommy Thompson

    When I was the company armorer in CSC 2/6 Infantry, Berlin Brigade, I had an M16 brought back from field training that had separated at the chamber. The chamber was splayed open from excessive pressure; and, it was caused by BLANK cartridges exploding in the magazine. During “hit the dirt” practice, the soldier’s full weight had landed on the magazine, forcing it deeper into the magazine well. When he got up and began to “shoot and move”, somehow *every* blank in the magazine exploded with enough force to destroy the weapon. Luckily, he was firing from the hip when it happened; and, since it was winter, his overcoat was the only casualty.
    Of course, that night we had a surprise arms room inspection and I had to come in to show the inspector where the “missing” M16 was, in a sandbag in the locker with our mortar tubes…
    Lots of paperwork later, the rifle was replaced.

  • Berger

    How does a .308 bullet chamber in a .223 chamber?

    • STFUTWIT

      It won’t and neither will a .223 camber into a .300BO, but one or in this forum will say otherwise, so beware…..lol

  • Rocketman

    As a long time re-loader I would suspect that maybe someone was using reloads and put a double charge of power in one case. If your not paying close attention and don’t safety check after the powder is added it can happen.

    • Secundius

      If memory serves, Back in 2013. Didn’t Winchester recall a Batch of 5.56×45 M855 Pene. For having the Wrong Propellant Charge in the Cartridges…

    • Kent San

      So why to you think the title mentions 300BLK?

    • Kent San

      So you’re ignoring the title about the article and the conclusion that 300BLK is a bad caliber because it can be fired in a 5.56mm barrel and think this is a reloading mistake? A reloading mistake can f-up EVERYTHING.

  • STFUTWIT

    Just chatted with a master reloaded and said the rounds are not interchangeable….neither will fire if mixed up…..said only two ways for this….testing subsonic and bullet lodged in barrel and he didn’t know, then fires a regular load round…..or, cartridge was loaded too hot creating far too much pressure in the camber too fast…..bet this guy loaded the wrong powder into the cartridge and now blames the gun……much like democrats do after a terrorist murders with a gun…..it’s all the guns fault….

    • Kent San

      If my link below with the URL that reveals your “master reloaded” (sic) doesn’t know what he’s talking isn’t allowed, I suggest you search on “300Blackout /.223 Kaboom.”

      • STFUTWIT

        Hmmm, guess you should talk with him since the two of you know it all…..yeap.

        • Kent San

          No, you just assume because he reloads that he know everything about firearms. I guess he doesn’t. Ask him to take a 300BLK casing, seat the bullet way too deeply and see if it doesn’t chamber in a 5.56mm rifle barrel. I guess you didn’t bother to open the link I tried to help educate you with to prove this is a very rare, but quite possible, mistake to make. I just chatted with a psychiatrist, he says you’re stupid.

          • STFUTWIT

            What link? The non-existent one….oh, yeah….I’ll get right on it. And you avoiding the part about you having a discussion with him says so much. And your shrink is ass raping you too….

          • Kent San

            Did you do the search terms I shared that would lead to the link I told you was awaiting an okay from the moderator? I don’t run the site, but can see what’s awaiting approval.

            Lazy and a moron is a really sad way to go through life. You’re sad.

          • STFUTWIT

            And you avoid discussing your “expertise” with the guy I mentioned like liberals avoid actual facts, but you want to continue with insults…..and you claim your “300Blackout / 223 Kaboom” is a link…..a-tay porhee….and my user ID is for folks just like you…..oh boy.

          • Kent San

            Your friend is sadly a dolt that is so insecure he can’t tell you he just doesn’t know the answer. After all, he’s dealing with a guy like you that thinks doing X makes him an expert in Y. That’s your problem.

            So let me paste the text for you since you’re too lazy. Actually it’s for others with a working brain:

            “I’ve read a few stories recently about someone, somewhere, shoving a 300 AAC Blackout cartridge into a .223 / 5.56mm rifle and pulling the trigger – subsequently blowing their gun to bits. Some folks call BS and say it can’t happen as the rifle won’t go into battery and fire.

            “Well, I’m a believer now, considering a guy 3 lanes down from me blew up his fairly nice looking AR today. In the confusion, I was not able to get the brand of the rifle, but that matters little. Containing 55,000 pounds per square inch of pressure is not in the job description.

            I was pretty occupied with my own business, gleefully trying out two new SilencerCo silencers for which I’ve waited about 10 months. A 22 Sparrow SS and an Octane 45 by the way. And yes, they’re awesome. Happiness = That feeling when your slide cycling makes more noise than the gun shot. That nirvana was achieved with a Smith & Wesson M&P22 with a SilencerCo Sparrow using Aguila Subsonic 60 grain .22LR ammunition

            Suddenly I heard a “splosion” noise and a scream from a few lanes to my right. Running over to see what happened, I saw a man holding his hand and obviously somewhat shaken up. I immediately started looking at his face as he was somewhat disoriented and all was clear there. His left (support) hand looked like he had fondled a few bricks of charcoal for a while. Thankfully, and maybe miraculously, no cuts or blood anywhere. While his hand was “stinging like crazy” in his words, there did not appear to be any burns of consequence. This is one incredibly lucky guy, especially since I can’t be sure he was wearing shooting glasses. The way they were placed on the table, I’m not sure he had them on when he blew up the rifle.

            Here’s the apparent sequence of events, picked up from listening to the rifle owner and the shooter.

            The owner had two uppers at the range. A .223 and a 300 AAC Blackout. He obviously hand loads as there were 100 round ammo boxes of each type nearby.

            The shooter appeared to be new and somewhat inexperienced. I can’t be sure, that’s just an observation from seeing the interaction after the kaboom. Either the shooter picked up a magazine full of 300 Blackout cartridges, or the rifle owner handed him a magazine loaded with Blackouts. I can’t be sure. They weren’t sure themselves.

            The shooter loaded the magazine of 300 Blackouts in the .223, chambered a round, and fired. Then the Kaboom. I was not able to discern, nor was the owner, whether the shooter felt anything abnormal trying to chamber the first round. As the shooter appeared to be inexperienced, I’m not sure they will ever sort that out.

            Once we determined the shooter was physically OK, I wanted to get out of their business, so I didn’t get any photos of the rifle, but I can describe the damage. In short, it was pretty much totaled. Perhaps the Magpul front hand guard, rear stock and trigger group can be salvaged. That’s about it.

            The magazine blew up, along with spring and follower. And you can see what happened to the other rounds in the picture here. I *believe* the fact that he was using a polymer magazine may have saved the shooter from additional injury. The explosion clearly took the path of least resistance. Perhaps a metal magazine would have allowed more pressure to go in other directions in addition to out the magazine well.

            The magazine well on the lower was bulged out. Kind of like an Elmer Fudd cartoon shotgun.

            The upper receiver was also bulged out from the explosion.

            The bolt and carrier were both trashed – bent all to hell and completely stuck in the upper and barrel extension.

            I assume the barrel extension and barrel were trashed, but as everything was fused together, there was no way to tell for sure until they rip things apart. Shoving a .308 inch diameter bullet into a .223 inch hole is asking for damage I would think.

            While I was not shocked at the damage to the aluminum upper and lower, I was surprised at how much the bolt carrier and bolt were trashed. That’s hard stuff there.

            With the brief opportunity I had to look, that’s about all I could tell. But now I was curious. Would similar rounds allow the .223 rifle to go into battery? I decided to try under much safer conditions.

            After removing the bolt and carrier from my Smith & Wesson M&P 15 VTAC (5.56 chamber) I dropped in a .223 Remington round to get a rough visual on where it sat. OK, that worked fine, as expected. Next, I dropped a variety of 300 AAC Blackout loads into the chamber, exerting no pressure at all and just letting the round fall. As expected, the big subsonic rounds didn’t get close to proper depth, however some of the longer and skinnier bullet profiles did – mainly the 110 and 125 grain ballistic tip bullet types. Not to the full and proper depth, but close. Close enough where a little encouragement by an inexperienced shooter could force the bolt into battery.”

          • STFUTWIT

            Wow, such the “expert”….and how would you get anyone to listen to your dribble when you lack respect? Hmmm…..

          • Kent San

            Not such an expert unless compared to an a** clown like you posting nonsense and unwilling to admit you know NOTHING.

          • STFUTWIT

            Wow! Have you been looking in your mirror much….saying such negative bs to yourself is destructive…..but you “experts” know it all……LMMFAO…..if you can’t win a rational discussion, hurl insults….like a good little libturd

          • Kent San

            Goober F-tard

          • STFUTWIT

            And why don’t you admit you’re an utter COWARD who won’t have a conversation with him, so that mutes your entire menu of dribbling BS…..but everyone already knew that….FUKTURD……

  • Kent San

    If you doubted many people never read the title, caption, or article before posting declarative “expert” opinions on the topic, I welcome you to read below.

  • BluNos

    There is a saying we had in the submarine navy back in the ’70’s: You have to be smarter than the equipment you operate. I think that applies here.

    • glenn cheney

      That’s a fact Jack! Aside from the fact our toys had bigger “holes” than most other’s, we had our Folger’s coffee cans at the ready to catch the “sweat.”
      Sealion here, Pigboat DuJure…..seems pig something has always near, lol. I’ve been truly Porked! I mean blessed.

    • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

      Plus 5

  • Mike Lashewitz

    Well “Marky’s” comment makes sense. You know how all them cartridges look alike…

  • Pat Hines

    “Tactical T-shirts”, I think I see the problem already.

  • Michael Grogan

    There’s no way you could get a .300 blackout round chambered in a .223 barrel so the bolt would lock and fire the round. Mark from tactical t-shirts should never reload again. This is a reloading epic fail. Mark should stick to printing other people’s tactical wisdom on his t-shirts.

  • Warchild_70

    I just stick to .308 or 7.62X39 gets the job don’t can’t mix the ammo. 7.62X39 for the home defense and .308 for anything outdoors.

  • Shocked_and_Amazed✓ᵛᵉʳᶦᶠᶦᵉᵈ

    So, someone wasn’t paying attention and stuck a 300BLK in a 223? And is Marky mad because he did it?

  • glenn cheney

    Not to interrupt the thread, pun intended, but, question for the forum:

    Can anyone, without violating the political parameter, explain why, if we have a “major news event” that every company in the manufacturing, warehousing/distribution, retailing end that has an online listing suddenly go OUT OF STOCK. ???
    I’ve seen where some trader making his “book” might quip ” if a ship is sunk in the Straights, fuel availability will be adversely affected.” (For europe maybe, not here in the U.S.) Next day, an Exxon type jacks our jaws 30 cents a gallon and when we point out that WTI feed stock is well below those justifiable rates at the pump, they say “So solly Cholley, we global company, we must pork everyone fairly, equally.”
    Well, I did my research, nibbled for field testing, got my price points all set, let the orders fly, and……..ching, ching, ching, blap, blap, blap…..flop, flop, flop.

    Every receiver, upper and lower, overnight turned to aluminum dust, corrosion on the shelf or in the box. Yes, high dollar matched sets in the 500-600 range are there, if I were gonna do that, I’d head over to F-1, lay down the 7 bills for a skeletonized, colorized chassis, drop a match grade bbl. on and a top shelf trigger, an ACE stock would look good…..
    I know some company’s inventories without naming names as well as they do, bbls., bolts, receivers….everything went to OUT OF STOCK.

    I know our “friends” in the business of selling tools and toys are well aware of the occurrences….What amazes me is, how as if on signal, everyone goes dark thirty on us.
    Palmetto just now loosening up “blems” in low dough moe go….str-o be mo betto….Thought this might be an interesting discussion topic….scavenger hunting AR 15/10 parts.
    Mr. Moderator, please come out….the 300 GO/NO GO conflict seems to have passed, laundry drying on the line (tee’s), you hunkered down in your bunker?

  • Wes Bielinski

    HOW did a .300 BLK even chamber in a .223? I can understand vice-versa. The bullet being bigger should have gotten stuck on the rifling and the bolt should not have been able to close, unless he forced it to close, which pushed the bullet back into the case and basically created a small grenade. I blame the operator and not the bullet/gun.

    • Joseph Goins

      Did you not notice the tag at the top of the page that said “out of battery detonation”?

      • BigFED

        You assume that we read all the tags! And a properly made/operating semi WILL not function out of battery.

        • Joseph Goins

          No one said it was made well.

      • Wes Bielinski

        No, I don’t look at tags. This isn’t possible because if the bolt is NOT locked the firing pin cannot be hit by the hammer because it’s not it the right position.

  • Roadrunner0

    A mechanical keyhole in a plate that sets in the top of the mag well and a corresponding key protrusion on the mag would solve this and make it idiot proof.. Or a specific shape of the mag lock that only mates to a same shaped hole in the mag..

  • Rap Scallion

    Marky are you a liberal trying to be a shooter……did you ever get paid by Hillary to blow your hand off????? IT IS NOT THE GUN OR THE AMMO….wanna bet????

  • Max Glazer

    How on earth did the weapon even fire considering that the bullet shouldn’t have even made it into the barrel? We are talking 2mm difference between barrel bore diameter and bulet diameter. The bolt carrier shouldn’t even have gotten into position for the firing for the bolt to close and firing mechanism to actually work.

  • Striker333

    So how’s the shooter doing? That was a bad mistake, but we all make mistakes…some BIG mistakes+some small…I prefer small mistakes-

  • Robert Michael Jr Cottell

    I hope that Marky doesn’t shoot much, he might hurt himself. 😜🔫👍

  • Richard Lutz

    Makes me think that if you have ARs is should be in 5.56x45mm and not have them in any other calibers.

  • cnnspy

    Blame the manufacturer of the upper and magazine for not making the caliber markings more prominent as well as putting in some sort of idiot proof safety device that does not allow this to happen…or they get sued.

    • kcshooter

      Idiots like you are why we have billboards on the side of handguns warning us that they fire with the magazine removed.

      How bout you just pay the f attention instead, m’kay?

  • kcshooter

    No reason not to have AR’s in multiple calibers, unless you aren’t smart enough to keep wrong ammo out of the chamber.
    It isn’t the round, or the gun, or the manufacturer. Rather than trying to blame anyone else, take personal responsibility for you own actions.
    Yeah, it’s easy to mix up ammo – if you’re stiupid.

    • STFUTWIT

      Or press your luck with a hot load.

  • Brandon English

    Imagine if that were a polymer lower. The fact it is a Colt and the expensive halo sight, makes me think this was a person new to the firearms with more money than brains. Well, at least the guy who loaded the magazine. I hope the shooter was shooting lefty and had eye protection on. I guess it is a good thing that .50BMG does not fit in a standard AR magazine.

  • Abad Don

    Marky should get a Magic Marky and marky his sh!t. Dumb f^$ker…

  • rob

    It’s bush’s fault and your a racist 🙂

    • Realist

      An oldie, but a goodie…haven’t seen/heard this comment since Obama first got elected…

  • 33Charlemagne

    A good way to avoid a problem like this with ARs of different calibers is to have distinctive furniture for each caliber. If I get a 5.45 AK74 to go with my current 7.62 AKs I am going to get one with a triangle sidefolder to differentiate it from my 7.62 Kalashnikovs , which either have fixed stocks or poly sidefolders Of course 7.62 and 5.45 AKs have different magazines and mag wells so an accident like this is not possible with an AK but I still would not want to pick up the wrong magazines to go with a rifle in an emergency situation.

  • twr

    His dad’s gonna be pist…….

  • AJ187

    Stupid is as stupid does. Owning a 20 gauge and 12 gauge, let alone shooting them at the range the same time is more dangerous than 300/556 detonation.

  • me ohmy

    look at what you just did.. you made batman crap himself… happy now?

  • Lonnie

    That pesky ole 300 BO cartridge snuck into the magazine! SEGREGATION NOW! Segregate ALL cartridges regardless of sex, race, color, creed, speed, weed! Weed? Where’s my weed? I can’t find my weed?

  • Ed Gleason

    Marky is lucky he’s alive and he needs a little spray paint on his 300 BLK mags dumb ass.

  • JoelM

    What ammo would you mix up into a .300 blk to make it blow up? I’m only aware off it being possible to load .300blk into a 5.56 to cause a possible blowup. 5.56 won’t chamber in a .300 though. Not even close. Not even with superman pounding on the forward assist.

    The last time I saw a rifle blown up like this it was a bad commercial load that had pistol powder left in the loading machine from an improper clean out between production runs.

  • sanman99

    After wasting my time opening this I now know what?

  • Duke of URL

    O. M. G…

  • Mikial

    To be fair, Marky wasn’t condemning the cartridge, he was pointing out that too many people buy it who don’t know what they’re doing with it and this is the result.

  • AirborneSoldier

    One in how many?