Bushmaster 300 AAC Blackout

Bushmaster predictably launched a rifle chambered in .300 BLK. Bushmaster 300 AAC Blackout features a 16″ barrel with ACC Blackout muzzle brake, quad rails and Magpul furniture.

Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


  • mtptwo

    And the 7.62×39 rises from the ashes to become the .300 BLK *sigh* I thought the whole idea behind new cartridge development was to develop something new.

    • JMD

      This is like a more versatile, more useful, corrected version. It’s not “new”, but it is an improvement.

    • Other Steve

      Go extensively use a 7.62×39 in an AR and let us know how that works out.

      There is a lot going for a 30cal bullet in shorter barrels. In longer barrels there is a better selection of hunting bullets. Etc Etc Etc, there is definitely a purpose for this, it’s not just a x39 rehash.

      • Bill

        I have to agree here. Don’t focus on the caliber though that is a huge part of it – a .30 cal with flat trajectory. The key in my view is that it’s using an AR-15 platform with minimal changes except for the barrel.

    • Bob

      OMFG… Where is the ACR in 300 Blackout???

      • JMD

        Congratulations! You win one internet for being the last person who remembers the ACR!

  • Lance

    Looks fun and even better w/o the need for earmuffs.

    • Other Steve

      If you’ve ever heard supersonic centerfire rifle rounds shot with a suppressor you know you still probably want ear plugs at least. The action slamming shut on the AR is still loud to at least the right ear. The crack is never quiet either.

      I get the mistake though, this is something YouTube videos don’t really convey.

    • yeah you may not need earplugs if your using subsonic ammo by yourself , but i wouldnt do it, but if you go to the range with a suppressor make sure to take them anyways cuz you never know who will roll up with a m44 lol

  • GreenPlease

    @ mtptwo:

    The 300blackout, IMO, is more versatile than the 7.62×39. The ability to take an AR-15 patterned rifle (which seems to be gaining global acceptance of late) and simply swap the barrel out and be able to run a .300 caliber bullet is highly appealing. The ability to run the same bolt, carrier, and magazines as 5.56×45 really lowers the cost of entry. As ammo prices come down I see the appeal of 300 blackout increasing.

    I’m doing my first .300 blackout build next month 🙂
    I just really wish someone would make a barrel with a serviceable integral suppressor so I could run a 16″ suppressed rifle without having to SBR it. That would be the dream.

    • Other Steve

      I’ll tell you now, just SBR one AR lower. It’s worth it. Of all the rifles to be SBRed, an AR should be the first. Most versatile.

    • W

      yeah i like what the 300 black out has to offer. I hope to see this cartridge gain widespread popularity. I couldn’t think of a better CQB cartridge.

  • Matt G.

    Hey look at that! A bushmaster that isn’t completely ugly! I’m impressed.

    • Other Steve

      Did you not see the rails? Have you never had the uh, pleasure*, of using a YHM quad rail?

      *Pleasure comes when putting the rifle down

    • W

      ill admit that bushmaster is not the greatest firearms manufacturer, but its also not the worst. My experiences with Bushmaster AR15’s and YHM parts have been quite good.

    • Michael

      Welcome to the 21st century, Bushmaster. Bushmaster is by no means terrible quality, but I’m pretty sure they think they’re still as popular as they were in the 90’s and can charge ridiculous prices for their plane Jane, featureless products.

      Now, they’ve finally decided to release something that’s relevant, but again will probably fall victim to their ridiculous prices.

  • cue the bushmaster bashing in 3……2…….1…..

  • Charlie

    They’re making AK’s in 5.56×45 and 7.62×51 nowadays, so I guess turnabout is fair play.

  • John Doe

    Will it cost more or less than an arm?

    Starting my .300 AAC build soon.

  • AznMike

    Just curious, are Bushmaster rifles no good or something? My dad owns one and I have shot his friend’s Bushmaster and both of them seemed just fine, am I missing something or are they really just not good?

    • Michael

      It’s not that Bushmaster rifles are especially bad, it’s just that they are overpriced for what you get. There are much better, more proven options for the money.

      For instance, their Bushmaster® MOE MID-LENGTH carbine has an MSRP of $1247. It’s got MOE furniture (which IMO, is not better than standard furniture), Magpul MBUS, and MOE stock.

      The barrel is a 1:9 twist (cue 90’s Bushmaster logic), bolt is not HPT or MPI, and we’re not even told what the barrel is made of (The premium 16″Heavy Barrel is chrome lined in both Bore and Chamber to provide Bushmaster accuracy, durability and maintenance ease)–classic vague descriptions designed to attract customers that don’t know what to look for.

      Will your Bushmaster explode in your face and kill everyone around you when you fire it? Probably not, and in fact it will probably run great.

      But are there much better options available with better features at lower prices? Absolutely, from multiple companies.

      I guarantee you the price on the above featured rifles will be over $2000, which is just laughable with the amount of AR manufacturers out now.

  • my hands aren,t tied by the geneva convention. hollow points 223 cal. suits me fine.

  • Otis childers

    I had a bushy m4 a3. Ran great never an issue. My buddy and I bought them for 750 10 yrs ago. I sold it to fund other guns and have since realized that selling guns is a looser deal. I also have an acr. I shoot 3 times a month with many people. Out of all my weapons, none are more well recieved then the acr with eotech and magnifier. I was shooting it 400yds with iron sights last week. I was amazed every time I heard the propane take “gong”

    The 300 blk is appealing only in an sbr roll. As the bulistic advantages are lost as the barrel gets longer and levels the playing field.

    Exciting to reload though if your like me and load thousands of 223 a month. All that brass can be easily converted with a sizing die and a Gerard case trimmer. I’m very excited. New bullet at a fraction of the cost.

    • Dr. Kenneth Noisewater

      Yep I was hoping for an ACR barrel, looks to be a lot less hassle than the 6.8 swap for not much less performance..