Quote Originally Posted by Uffdaphil View Post
Happy day at the range. Sprinco red spring with the same H3 buffer solved the problem. For some reason Pmags all locked back on a single round while a Lancer .308 would not. Stiffer metal feed lips?
When I was battling my over-gassed .308, I found that the PMAGs would still feed but the Brownells metal mags wouldn't. After looking at the brass, it was clear that the brass was "binding" due to friction on the metal where as the polymer on the PMAG was more slippery and fed better. Obviously the whole system wasn't operating correctly, but it was interesting to see how much more friction the metal mag causes.