If you thought the origional PMag test videos were a little crazy, you haven't seen nothin' yet. Green and tan follower G.I. mags, PMags, Tapco mags, Troy Blattlemags, Tango Down ARC mags, and Lancer AWM. The magazines get soaked in various cleaners overnight, run in the dishwasher, heated with MRE warmers (I dunno either), dropped multiple times. . .
There were some mag body cracks, rounds popping loose, one mag rusted, one badly rusted spring, some discoloration, one floorplate melted some, a floorplate came loose, a couple dented magazine bodies, an explosive disassembly, and even a cracked follower.
Perhaps also of interest - Unscientific PMAG Chemical Tests
I was beaten to it by TheFirearmBlog, but if you haven't seen it, it's worth checking out.