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PMAGS seem to work flawlessly in AR15's, but are limited to 5 rounds. The LAR pistol mags give 10 rounds, and seem to be reliable, but I don't have alot of experience with them. Maybe you should get one of each and see which you prefer. Also gen3 pmags are a little more grippy than gen 2. Also of note, mags that run great in one rifle, may not function as well in another one (same with ammo choices), unfortunately its pay to play to see what works for you.
I like the 5/30 and really like the size of the 5/20 pmags but 10/30asc mags are nice for when you need the extra ammo and/or need them to fit pouches nicely.