Multi-Caliber AR Mag

One of the weakest links in the reliability of the Stoner system is the magazine. Modern synthetic mags have greatly improved the situation, but things still get weird when you try and make an AR feed rounds other than 5.56mm. This year at SHOT Show I saw what one company thinks might be a solution for feeding different cartridges in the form of a multi-caliber magazine. The UNIMAG is RZE’s first production-ready firearm component and it claims to provide greater flexibility in ammo choice for gun owners and enthusiasts.

It’s compatible with AR-15s and other rifles that use a STANAG magazine, and is reportedly proven reliable and functional with at least six different types of ammunition. The secret is a two-piece, self-leveling follower that maintains stability while accommodating the changing shape and taper of different cartridges, and a self-adjusting magazine shell that adjusts to various cartridge diameters. Compatible cartridges include .223-Rem. and all of the cartridges based on that case (5.56mm, .300 BLK, .204 Ruger), 5.45×39, 6.8 SPC, 7.62×39, 6.5 Grendel and .458 SOCOM.


Scott Mayer

“Shooting Guns & Having Fun”



Scott Mayer

Writer at John1911
Mayer began his outdoor industry career in 1993 on the NRA Technical Staff where he became American Rifleman magazine first Shooting Editor. Mayer left NRA and entered the business end of publishing in 2003 as Advertising Account Executive for Safari Club International SAFARI Magazine and Safari Times newspaper. In 2006, Mayer was named Publisher of Shooting Times magazine where he was also tasked with launching and leading Personal Defense TV, the first television show of its kind.

In 2008, Mayer returned to the editorial side of publishing, this time in the digital field, as Editorial Director for Guns & Ammo, Shooting Times, Handguns and Rifleshooter online magazines. After a brief stint in 2011 as the Digital Media Director for an ABC TV affiliate, Mayer returned to the outdoors industry and Safari Club International where he is currently Assistant Publisher and Multi-Media Communications Editor.
Scott Mayer

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