My new AR 15 only shot 60 rounds Winchester.55gr. Was having some extraction isues but resolved problem with new extractor spring kit. And polished my feeding ramp. Now extracts perfecr. But now the problem is the gun wont fire. I loaded 10 rounds of pmc 55 gr. And nothin gun just went click.. I tried my lower reciver ans bolt with charging handle on my friends upper it works perfect so that means its my upper right? Please help me out. I want my gun to fire perfect thanx I apologize for the previous edit i didnt realize what i did.