Multi-Caliber Capable AR Magazine

Ethan M
by Ethan M

DIY designer Jing Zheng has submitted a few videos to YouTube of his multi-caliber capable AR type magazine design. He first announced it to the public in December 2011, as the Longziz #2, it is capable with 6.5 Grendel, 6.8 SPC, 5.45x39mm, 7.62x39mm, and the STANAG mag. staple .223/5.56mm. He is currently looking at testing with the .300 BLK.

In this video he loads five rounds from each caliber into one single magazine, he fires four rounds, removes the magazine, fires the last round of that caliber and moves on to the next caliber carbine.

Some buzz has been around since 2011, the following was a post he made to AR15.com when he first announced it.

“The idea is very simple. The M43 round will introduce far more tilt inside of the STANAG magazine comparing to other calibers. If a non-tilt follower is used, the rounds can have a nose dive if certain amount (very small) of ammo is inserted, hence more prone to induce jam. If a tilt-able follower is used, the follower tend to tilt too much if a large amount of ammo is inserted, such that the follower would slide into the gap between the round tips and the front magazine wall and cause the ammo tail sink into the cavity the follower left behind, which also introduce jam. So I thought, maybe I can use a two piece follower approach, one that is non tilt, while the other is tilt-able. This way, the follower assembly would be stable inside of the magazine, while the tilt-able piece to accommodate tilt introduced by the ammo.”

Jing is no stranger to rethinking existing designs, the Longziz #1 is a bullpup rifle he developed over several years, which utilizes AR15 lower receivers.

The following test is loading the same magazine entirely with one caliber and quickly unloading the weapon down range. The video isn’t as interesting but I appreciate he does not edit or retake the video and instead shows the few failures with 5.45x39mm and 7.62x39mm.

Though some are worded as an estimate, the magazine capacity is as follows.

  • 23/24* rounds of 6.5 Grendel
  • 25 rounds of 6.8 SPC
  • 28 rounds of 5.45x39mm
  • 24/25* rounds of 7.62x39mm
  • 30 rounds of .223/5.56mm

* The extra round will fit but will not insert easily on a closed bolt.

The initial magazine release will be of steel construction. There is no price or date on production, it is simply too soon to tell, but he assures repliers he is working towards this goal. Considering the cost of purchasing several types of magazines and the price of the higher quality special caliber mags – what would our readers pay for this kind of magazine?

Ethan M
Ethan M

Ethan's firearm interests are mostly with Cold War era select-fire weapons and their semi-auto counterparts.

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  • Carl Carl on Jun 08, 2013

    Maybe We can finally have Straight 7.62x39 AK Mags...

  • Longziz Longziz on Jun 08, 2013

    Thanks Ethan for your article! And thanks for some very good comment I have read here. I will take some of them into consideration for the production version.

    Please allow me to make some clarification here as well. The mag is not intended to replace any market existing mags, let along to be adopted by the military. Rather, it is to served the need for what is lacking in the current market. 6.5, 6.8, 5.45 and 7.62X39 to be specific. And just in case you want to use it to feed your 5.56, it is possible. So far it is just a prototype, so I will let you guys to judge the reliability of it when it is available.

    As of putting wrong caliber into the wrong rifle, first, the mismatch caliber in one mag is just served to show the fact that the mag is not picking on the caliber or cartridge casing. The reason I did it is no other than show-off or spicing up people's interest. There are un-intended consequences if it is wrongfully done or just been careless or even stupid. Maybe I should have people sign up a disclaimer before they buy?

    The current GI style mag are capable for 223 and 300blk. I haven't seen anyone not buying GI mag for 300blk simply because it might be mixed up with their 223. The key is to clearly mark them and separate them in storage. I don't see any point why the same technique can not be used with this mag.

    Anyway, thanks for your comment and please keep it coming so I know any draw back this mag might have, so I can address it accordingly before I put them into the market.

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