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What is the point?
Uzi mags are one of the best subgun mags ever...........and cheaper than Glock mags.
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I agree with you... as long as we're talking about shooting 9mm.
I've been having a difficult time getting a mag that will work well with my .40 barrel on the Uzi. The ProMag .45 mags work to an extent, as do the IMI .41 AE mags.
But because of the width of the magwell, the way a .40 stacks in the mag is less than ideal. So when you put too many rounds in, the stack will start to bind up and push outward, rather than downward. I had thought this was just an issue with the Promag's thinner sheet metal body, but the IMI .41 mags do the same thing. Those are marked for 20 rounds, but the body will swell to the point I can't insert it in the magwell if I load over 17 or 18.
This should give you an idea of what I'm talking about regarding the stack in the mag:
I tried an Uzi lower with a MAC magwell, but it did not work well with my gun. I might try a different one some time.
But the option to use extended Glock .40 mags would be nice. Glock mags are easy to find, designed for the round, and consistent, mag-to-mag.