Perform problem:  About the third round I get a light-weight hammer strike.  I've tried both of those H2 and H3 buffer weights.  H2 I was only finding one particular shot, H3 I now get two pictures off.  I've tried this on two uppers, a person carbine and a single pistol, but utilizing the same BCG.  I ordered an aimsurplus NiB BCG, I'm about