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I had issues with the M3 dropping free from my GEN 2 Noveske lower. Had to do some file work on the tab on the spine. They are good to go now, though they seem to need a little more love to lock in place on a closed bolt compared to the M2 or steel mags. Production dates are 2/12 and 6/13. They did however drop free from both of my N4 Noveske lowers and my issued Colt patrol rifle before making any mods.
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I bought a new Window M3 and it drops free from the exact same Knights lower the new non-window m3 wouldn't. I guess the window version works in a few more rifles. Its time to get a bunch of them since now I can get them for their normal price. I have already gotten rid of the ones that wouldn't drop free. I don't want any mags around that wont work in all my rifles flawlessly.
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15 M3 Pmag 30 rnd and all drop free from my Armalite A2 rifle and BCM LWT Midlength. Colt would not, but had a lot of problems with it anyway, a lemon. 2012 date codes ordered them just before the Newtown Tragedy.
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Gen3 Pmag drops just fine from my aero precision lower.
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25 M3 30 rnd Pmags tried in brand new Mod1. None of them would drop freely. They disengaged but hung up in the magwell. Production dates of 4/13 & 5/13.
Tried Troy Battlemags & they all fell freely as did the USGI mags.