Operate problem:  On the 3rd spherical I get a lightweight hammer strike.  I have attempted each H2 and H3 buffer weights.  H2 I was only having a person shot, H3 I now get two photographs off.  I've tried this on two uppers, a person carbine and a person pistol, but utilizing the same BCG.  I purchased an aimsurplus NiB BCG, I'm likely to try