It is what it is....... I have never had that issue with pmags either unless i wasn't paying attention and loaded 31. All my pmags have 1/8in give at 30 and merely take a mild slap to seat themYou should come around when Im shooting any of mine with the Pmags, and especially when the suppressor is on the gun. Its probably a 25% failure to lock back on empty with them.
Never had that issue with the GI mags.