My wife and I just purchased two DPMS 308's. Mine is a SASS and hers is the REPR. We just got her can in and went to the range. We have run about 250 rounds combined through both guns and every once in a while we will have a case just jam up in the chamber. After I get it out, it is always the same case markings of RP on the primer end. I know it stands for Remington Peterson but is there anyone else that has these rifles and or has the same problem?