New Multi-Caliber AR-15 Magazines From RZE

Ross Zheng Engineering, the company that featured their first product during SHOT Show in January of 2015, is finally announcing its availability. The product is their UNIMAG, which is a multi-caliber magazine designed for AR-15 platforms. The UNIMAG can be used with 30 rounds of .223 Rem, 5.56 NATO, or .300 BLK, 29 rounds of 5.45x39mm, 26 rounds of 6.8 SPC, 25 rounds of 7.62x39mm, 24 rounds of 6.5 Grendel, or 12 rounds of 458 SOCOM. Their patented design includes their own controlled-tilt follower which is meant to decrease jamming and increase stability.

The UNIMAG is set to ship this coming fall 2015, but pre-orders are being taken at the company’s website:    or you can visit their main page at UNIMAG’s MSRP is $49.99.


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  • jeff k

    so this is only for the ar15 platform i take it (because of the mag catch position?) would have been cool if they made a mag that fit in aks and ars and took both ammo

    • Vitor Roma

      Very different designs, not feasible at all. But yeah, one could dream.

  • Isaac Newton

    I think a cool idea would be to make a .223/556 magazine or follower that won’t allow 7.62X35 to load/feed and vice versa for safety. Respectfully, the philosophy of this magazine seems to maximize the opportunity for an accidental loading.

    • iksnilol

      I thought one of the big selling points of 300 blk was that you didn’t need new magazines?

      • NDS

        Yeah there’s no reason to redesign anything. I use tan mags for 300Blk and black mags for 5.56, it’s not complicated. At all.

        • iksnilol

          Or even simpler, just wrap some electric insulation tape. It is cheap and there’s different colors available.

          • NDS

            I use said tape to denote subsonics, FMJ practice stuff, duty loads etc. The tan / black scheme works for me as it keeps the mags completely segregated.

          • iksnilol

            Simple and smart system. I like it.

        • Isaac Newton

          That is fair, but that system may not work for everyone. My point is I would not trust someone to use that system to load my magazines. If I did it myself no arguments.

          • NDS

            Why would you trust someone else to load your magazines? Never shoot any ammunition through any firearm unless you are absolutely sure of its origin.

          • Isaac Newton

            I think you misunderstand my point. The point is the color coded system is not something I would advocate other people use if a truly dummy proof system existed as I alluded to in my original post. For example I would not sell a tan mag and a black mag as a set and tell customers that this will prevent accidents.

        • JB

          I use the “Don’t be an idiot” method. It’s worked out pretty well so far.

          • NDS

            +1 on this one buddy, my system is for my own organization since I keep tons of loaded mags… Not to keep some other idiot from blowing himself up.

  • some_guy

    MSRP $50, it’s going to flop unless they change that. Anything sub $25 would be pretty reasonable.

    • Paladin

      Even at $50 MSRP (street price will likely be lower) people using multiple calibres could save money going with these magazines. It saves having to buy a whole set of magazines for every calibre.

      The way I figure it you hit the break even point around 3 calibres, depending on how much specific mags for your chosen varieties of gun food cost.

  • blackspike2710

    $50 for a magazine that was specifically designed to hold ammo that was specifically designed to fit into standard $10 magazines. What am I missing?

    • Nolan

      It is suppose to use calibers that normally require a different magazine such as 6.8spc, 7.62×39, and .223 all in the same mag… But at 50 bones you’d be hard pressed to find people that will want this, I would think.

  • Tyler McCommon

    A cool idea if you want to use the same mags but different calibers when you switch uppers. Of course the MSRP will probably doom this product.

  • thedonn007

    As others have said. This is a neat idea, but it is priced way too high.

  • iksnilol

    inb4 “wrong caliber in chamber” mafia shows up.

  • roguetechie

    I wish Longziz the best of luck in this venture, but they really should be selling just followers for common magazines.
    honestly I just want him to give us a shot at buying longziz #1 kits… Though judging by the cost of these … It’s going to be $4999.95 for the kit or $7999.95 complete.

    • JB

      It looks to me like the geometry of the feed lips is different, I don’t think just a follower would accommodate the range of calibers the mag does.

      • roguetechie

        That is too bad… I think Mr. Zheng is a very talented individual, and I want to see what he comes up with next. So I have to wish him success.

  • Matt

    C’mon, the guy finally shows up with a product ready for market and everyone is pooping on it. If it works well then it’s very cool for someone with different caliber uppers, and it could save them money. If the calibers are dissimilar enough then chambering is not risky, but that’s up to the user to control. If you have 300 BLK and 556 stick with what you got. But if you have say 556 and 7.62×39 or 5.45, etc, then this is perfect. But I agree the retail price could come down to like $30, then it might sell briskly.

  • Rob Pierce

    Clearly John McLain identified that the mags with the tape are blanks.

  • Some may laugh, but the dude who proves he can design a magazine that works with a bunch of different calibers is a dude who gets hired to design bigger and better things.

    • Patrick M.

      With modularity being more and more important in government solicitations I wouldn’t find anything about this laughable. A mag for something like the SIG MCX that can reliably feed 5.56, .300 BLK, and 7.62×39 is definitely a game changer.

      • I doubt the magazine will be as reliable as dedicated mags, but who knows.

    • Jing

      Well, wait and see…

  • smartacus

    that 458 SOCOM in the picture is lookin sexxee