Anyone else having a problem stripping the first round from your Pmags? I've used DPMS and other brands of metal mags which work perfectly, but for some reason my LMT does not like to strip the first round. It leaves scrape marks on the round. I've even loaded one less than max and still no luck. I find it funny as its the complete opposite with my POF. PMags work great for that but problems with metal mags.