I have a lot of pmag in 20 & 30 rd and they have been ok, but in competition I have had failures during mag changes with the pmags. The issue for me was during the change, when I tapped on the bottom to ensure it was seated, the round would come out of the mag partially (pointing upwards) and when the bolt is released the round would jam. I only use them for general plinking now.
I pretty much stick to colt and brownells aluminum mags, now
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