The Firearm Blog

The Cheaper Than Dirt Blogger has written a how-to on loading Bulgarian/Romanian/Chinese AK drum magazines. It is an interesting read for any firearm enthusiast nut.

Caleb got thinking about bolt action rifles and noted that no bolt guns exist to his knowledge that can feed from STANAG (AR-15 / M16) magazines.

everyone seems to be talking about how the world/economy/social order is going to collapse soon (it’s not) I figured the best rifle for that collapse would be a bolt action .223 with an 18 inch barrel, forward mounted optic, back up iron sights, and the ability to feed from standard AR15 magazines.

This got me thinking and I could not come up with one that did.

My artist impression of what such a Remington 700 would look like.

The Australian AIA M-10 “5th Generation” Lee-Enfield rifle comes in 7.62×39mm and feeds from a AK-47 magazine. The one pictured below is being sold on gun broker. Not many are available in the USA because after it was found out that some parts of the rifle (maybe the whole) was manufactured in Vietnam, they were banned.

While 30 round magazines are not as practical on a bolt action as they are on a semi-automatic, magazine parity with the AR-15 would be a big bonus. Remington and Ruger are you listening?

In March Brownells were awarded a contact for 1.4 million M16 magazines. They have just shipped the first 60,000. Interestingly these have a new propriety anti-tilt follower, instead of the normal green follower.

The new military magazine manufactured by Brownells

Larry, from Brownells, told me that the follower will unfortunately not be available to the civilian market as part of the contact prohibits them from using the design for any other purpose than the military.

The RCI XRAIL (Roth Auto Index Loader) is a auto index loader magazine extension that can expand a tubular shotgun magazine to hold up either 14 rounds (compact version) or 23 rounds (full version).

This video shows the XRAIL mounted on a Benelli M2 Tactical. The benelli magazine appears to be shortened and the gun can now hold a total of 26 rounds.

Now I will be honest with y’all, I don’t actually know what an “auto index loader” is. This is how I imagine the system may work:

* Each of those tubes are a magazine.
* Each of those magazines feeds into the shotgun magazine.
* Once a magazine is depleted it rotates.
* The final magazine contains a spring long enough to feed the shells that are in the shotgun’s magazine.

Because I enjoy making you suffer by awful drawings, here is a graphical representation. The blue box represents the shotgun magazine. The red boxes represents the XRAIL magazines. In this example the shotgun magazine holds three rounds while the XRAIL has three “magazines”, with two holding two shells, and the third a spring.

First two shots


3rd and 4th shot.


Last three shots

I have watched the above video frame by frame and there is seems to be some additional things happening during the magazine rotation. Maybe I am completely wrong … in which case I would have patented my above idea and not blogged about it

The system will be able to work on multiple guns. From what I have seen on youtube Benelli and Remington autoloaders work with the XRAIL. I don’t see why this system could not be adapted to work on pump action shotguns, aside from the fact that if would have to be mounted quite far forward.

A very interesting product. Hopefully it will come to market soon (and probably a video game as well, when game designers get word of it)

Hat Tip: Tactical Life

New Jovian Thunderbolt has written a post discussing magazine spring failure

I think the “spring tension is shot” excuse is a catch-all reason that is over used when us amateur gunsmiths run out of ideas. Like the way they blame ball bearings for everything wrong in turbofan aviation maintenance.

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Here is an example of a spring ‘problem’ that wasn’t from the Cooper Commentaries:

“Our distinguished family member J.P. Denis of Belgium reports that he discovered an abandoned MP40, together with several magazines, in a building that was being torn down. This piece had been left unattended for 50 years with all magazines in full compression, and they all worked perfectly. I think this is marvelous. When you think of the degree to which our culture depends upon springs, it is good to know that spring construction is so well understood.”

An interesting post. We really do rely on our magazine springs. Read it here.

Albert at The Rash Outdoor Chronicles has written a detailed tutorial, with lots of photos, explaining how to disassemble, clean and reassemble the Ruger 10/22 rotary magazine.

Read it here.

In last November for the first time in a long while did Ruger finally start selling mini-14 20 round magazines to the general public. Previously they had restricted them to law enforcement only. Now only 5 months later they are selling 30 rounders!

This is a great move by Ruger. At this rate we should be seeing a 100 round drum pretty soon

Bob Dylan got it right when he sung

Come senators, congressmen, please heed the call
Don’t stand in the doorway, don’t block up the hall
For he that gets hurt will be he who has stalled
The battle outside ragin’
Will soon shake your windows and rattle your walls
For the times they are a-changin’

They are selling for $49.95 at Ruger.com.

Hat Tip: Michael Bane via. Say Uncle

Albert @ The Rasch Outdoor Chronicles has reviewed the CMMG 28 round Immortal magazine for the AR-15:

CMMG claims that no other magazine offers greater performance under extreme conditions. It has their new stainless steel anti-tilt follower which features superb stability, minimal drag and unmatched durability.

The new CMMG braided wire spring gives 40% additional pressure over standard USGI springs. A nano-ceramic plated braided wire spring protects for over 400+ hours against salt sea spray.

Read the full review here.

Seen at SayUncle. It gave me a good laugh!

(Photo of PlasmaFox’s AR-15)

Repeat after me “clips are used to hold cartridges together for quick loading, magazines are used to hold cartridges for feeding into the guns’ chamber”

The best explanation of the differences that I could find is at The Gun Zone.

The terms are NOT interchangeable!

UPDATE: Drake from Magpul emailed me to say this was an issue with just one batch and it has been resolved.

This was a very small batch of PMAG’s that had this issue. We addressed the issues internally and solved the problem. We also followed up with all of our customers that we thought may have received these issue mags. Problem solved.

There is a discussion at the M4Carbine.net forum about Magpul polymer PMAGs cracking. Steve from Triad Tactical was running a training program and noticed a bunch of the PMAGs cracking in the same spot.

By the end of the first class, 50% of the pmags were broken. All of them had split where the feed lips meet to form a V on the spine. I called Magpul and they over nighted me 50 new pmags and a prepaid return label for all 50 of the ones I had, broken or not. They asked me a bunch of questions about the who, what, when, where and how the mags had been used. This was very cool and I was pleased with the way it was handled. I was back on track and had one course of 26 in the books, 25 to go.

More here.

The moral of the story is that diversity is the key. Don’t rely on one brand of magazine, especially if you are buying a whole lot at once. If a batch is faulty, regardless of wether it is metal or polymer, and you bought a whole lot you are screwed.

Many thank to Jay for the link.

I have covered the TangoDown ARC magazine in detail previously but this is the first photo I have seen of the transparent model.

Click to expand. Photo ⓒ Chen “SMGLee” Lee. Used with permission.

The magazine utilizes a unique two part design. By using a stronger opaque polymer for the upper part they can make a magazine that is hardier than if it was fully transparent. The “glue” that binds the two parts together is apparently harder than the rest of the mag.

More about the ARC here.

TaylorWSO @ ar15.com dropped a loaded Magpul polymer PMAGS onto concrete in -30 degrees, feed lip first:

So to the drop test. I wanted to see what they could do in the cold. I dropped it from the same table (3′ high) I have dropped metal mags from on the range. If you drop a metal mag on concrete from the same height it will damage the feed lips as to be unuseable-but you can bend them back. I was planning on dropping them on all sides but it broke before I could try it. From the table, fully loaded, no cover, both feed lips shattered when they hit the concrete. I expected it to break/crack but these things shot off and rounds went everywhere. I stopped the test right there as didn’t want to try it with any others on the other sides. You can see in the AK HTF that if empty they do fine in the cold.

So what does this mean.

IF you drop ANY mag loaded on the feed lips it will be useless. The Pmags might survive during the summer but all metal mags will bent hot/or cold. The metal mags can be bent back.

The plastic shatters when cold (duh) it doesn’t just crack.

I finally got a answer as to what these can do.

This test was dropping on concrete in cold weather. I had to clean off a spot to get down to the concrete. If the mags are dropped in the snow vs just concrete they do just fine. So the possibility of hitting on the feed lips in cold weather on a hard surface-very unlikely

The covers are great to keep out the snow – huge plus.

Overall they do just fine. I was surprised at the complete breaking vs. cracking buts that’s what cold can do.

The result: cracked/split feed lips:

uafgrad tried a simular experiment in even colder weather:

Ok Back to tougher in Alaska
…
Here is where it set for a period of about 18 hours. This was the “hi” temp for the period
…
The mag was fully loaded and dropped from a height of 36″ directly onto the feedlips (as previously requested) striking bare concrete.

Once it hit the ground, all but 6 of the rounds exited the magazine on to the ground.

Some plastics becomes become brittle in cold conditions, so this is not surprising. The good news is that Magpul are not sitting on their laurels. Their latest version of the PMAG can survive a drop from 5 feet onto concrete feed lip first, fully loaded in -30 F. See this video shot with a high speed camera:

A big thanks to Jay for the link.

Over the past four years TangoDown have been working with the Navy Special Warfare Command and the United States Special Operations Command on a new polymer M16/SCAR/AR-15 magazine called the ARC. Although the magazine prototypes have been around for a few years, the ARC is finally entering production and should be on sale in January 2009.

Click to expand.

As the photos suggest, the magazine is manufactured in two parts. These parts are then “glued” together (I am sure they use a fancier word). The join is supposed to be very strong.

An o-ring type silicone seal prevents dirt getting into the action through the magazine well.

The design has no floorplate which adds to its strength. Cleaning is done by holding the magazine upside down and spraying water or compressed air through holes in the follower. If the spring needs replacing you throw out the magazine and buy a new one.

I dug up this forum post from earlier this year:

The two-piece housing assembly allows us to use optimum ammunition ’stack’ in the design. We can tightly control the molding process at the same time, as we are making 2 small shots instead of one long one. Material freeze off is no longer an issue. The industrial adhesive we use to join the 2 halves exceeds the strength of the base material. Additional benefit is that we can mold the entire lower half of the magazine in a transparent/translucent material for ammunition viewing, keeping the superior strength reinforced material up top for the feedlips, etc.

The ‘gasket’ between magwell and magazine is actually a soft durometer silicone seal that is bonded to the magazine. It can’t shift or migrate on the magazine body. We used a foam seal at the Show for demonstration purposes. A specific type of magazine carrier design is underway, to answer that question. It will be trick.

In all the studies we researched, the primary mechanical cause of magazine failure to feed was due to feedlip issues. Springs and followers were down the list. By using a high quality coated spring, our sealed design would need to be replaced only when the lips were worn out and/ or damaged.

The follower is pretty novel, and is driven differently than existing baseline G.I.-type followers

This photo by SMGLee of a rapid prototype model shows the follower design and the o-ring/gasket seal clearly:

The retail price is $24.95. The magazine is currently available for preorder at BravoCompanyUSA.com. At that price I can’t imagine it going up in price or going out of stock due to excessive demand.

A video of SMGLee testing the magazine:

More photos and the full press release after the jump …
Continue Reading »

James Yeager tests Magpul PMAG that has taken a bullet. It appears to work flawlessly.

Thanks to Raif for letting me know about the video.