Function issue:  Over the third spherical I get a light-weight hammer strike.  I have tried out both of those H2 and H3 buffer weights.  H2 I had been only acquiring a single shot, H3 I now get two shots off.  I've tried using this on two uppers, just one carbine and one pistol, but utilizing the very same BCG.  I purchased an aimsurplus NiB B