Purpose challenge:  Over the third spherical I get a light-weight hammer strike.  I have tried out equally H2 and H3 buffer weights.  H2 I was only finding one particular shot, H3 I now get two shots off.  I've attempted this on two uppers, a person carbine and 1 pistol, but utilizing the exact same BCG.  I ordered an aimsurplus NiB BCG, I'm i