Multi-Caliber Capable AR Magazine

LongzizDIY 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. 
VIDEO

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?

 

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