Perform problem:  Around the third spherical I get a light-weight hammer strike.  I have tried both H2 and H3 buffer weights.  H2 I had been only finding just one shot, H3 I now get two pictures off.  I have tried this on two uppers, a person carbine and a person pistol, but utilizing the identical BCG.  I ordered an aimsurplus NiB BCG, I'm pl