Borrowed a rifle last night as nobody could tell me anything. Shot my buddy's DPMS sportical and a custom piston driven varmint gun last night and again this morning. Put them up against Pmag Gen 3 window/Gen 2 non window, a couple GI 30rd. a Tapco intrafuse, SIG branded poly mag,, and a GI with the Magpul follower and a ranger plate. Shot as good as the USGI in my limited testing (8 magazines, 30rds per mag in both guns) ran as good as USGI, Tapco ran about as good, Pmags, well, what more do I need to say, they're Pmags. surprise was the USGI with Magpul follower, ran as good as a Pmag. Was experiencing a little follower tilt (as evidenced by bullet noses jammed into the upper, DPMS shot with XM193, custom shot with MK 262 clones, except out of the Pmags because we couldn't get them to load, his OAL was a touch too long so we shot XM855) as evidenced by bullet noses jammed into the upper below the barrel extension, seemed they weren't pointing the nose up high enough, but we had that issue with USGI as well. Think I may pick up a few more and swap followers in about half of them for Magpul and do some more in depth testing. Still cheaper than a Pmag going that route around here as a new Gen 3 Pmag will cost you about double what I paid for the rad jacket mag. Going this route I'll be right around $15 per mag