I've got a half dozen of the 7.62 mags for my XCR and they've been flawless for function. The last couple rounds are a tight fit.
I put Magpul ranger plates on them and that makes them easier to handle.
I've got four 30/5 mags, 2 10 round XCR pistol mags, all are good.
The early C-Products mags were any issue, but only when shooting high capacity mags, that is to say, if you loaded 5-10 rounds, you're good. If you loaded more, you're screwed. We really can't test this in Canada
The newer generations were good. The robarm forum has more details.


















































