I saw this on PF, didn't you have some oil in the striker assy, I forget. Anyway my gen 5's have been, well, perfect.

As to the Pmags, I like them for range use, I bought 10 19's and 10 17's and I don't mind letting them drop to the gravel. My carry mags are Factory but so far I haven't seen any problems with Pmags. My buddy has been running them for 3 years now without an issue.