Perform problem:  Over the 3rd round I get a light hammer strike.  I have tried using the two H2 and H3 buffer weights.  H2 I used to be only obtaining one particular shot, H3 I now get two shots off.  I've tried this on two uppers, a single carbine and a person pistol, but utilizing the similar BCG.  I purchased an aimsurplus NiB BCG, I'm int