I used to shoot a SA 80,A2 and there was never a problem with the mags, though it was a military auto when I served
Usually the problem is in the crappy military-issue magazines. You never know how old/used they are, and the springs wear down over time, causing improper feeding. As an easy workaround, we always just loaded 28 rounds into each mag, thus preventing any issues.
I’ve heard great things about PMAGs, though. I’m considering buying a few, especially if DiFi gets her way.