Perform concern:  Around the third round I get a light-weight hammer strike.  I have tried equally H2 and H3 buffer weights.  H2 I had been only receiving just one shot, H3 I now get two photographs off.  I have tried this on two uppers, one carbine and one pistol, but using the exact same BCG.  I purchased an aimsurplus NiB BCG, I am gonna co