hmmm first I have heard of problems with PMAGs. Everything I have seen says they solve a lot of problems.
Are they talking about the new gen 3 ones maybe? they can be identified by the dimple pattern on the lower sides. Kinda like a golf ball. It is supposed to be for paint ID markings.
Brownells PMAG 10 packs
AR-15/M16 PMAG POLYMER MAGAZINE 10-PAK | Brownells