10, 20 or 30 round mags?
I've had no issues with the 10 round ones, but the 30 rounds usually have problems with JHP or JSP rounds if you load them fully. Often they've needed the spring from a real comblock AK mag or a Wolfe extra power AK mag spring to function at all.
Since the 30 round mags always seem fine if I only load 20 (or function fine after clearing a few feed failures in the first 10 rounds) I have some hope that the 20 round mags that recently became available will be the best solution. I've one but haven't had a chance to try it with JHP or JSP rounds, both WalMart and Academy only had FMJ when I went to get a few boxes to try.
I have a 16" 7.62x39 AR carbine and an 11" SBR, the mags work or don't the same in both guns.