Operate situation:  About the 3rd spherical I get a light-weight hammer strike.  I have tried both equally H2 and H3 buffer weights.  H2 I used to be only getting just one shot, H3 I now get two shots off.  I've attempted this on two uppers, a person carbine and a single pistol, but utilizing the identical BCG.  I purchased an aimsurplus NiB B