Operate situation:  About the 3rd spherical I get a lightweight hammer strike.  I've tried the two H2 and H3 buffer weights.  H2 I was only obtaining 1 shot, H3 I now get two shots off.  I've experimented with this on two uppers, a single carbine and a single pistol, but using the exact BCG.  I requested an aimsurplus NiB BCG, I am likely to t