Perform situation:  Within the third round I get a light hammer strike.  I have experimented with both H2 and H3 buffer weights.  H2 I had been only obtaining one particular shot, H3 I now get two shots off.  I've attempted this on two uppers, 1 carbine and 1 pistol, but using the exact BCG.  I purchased an aimsurplus NiB BCG, I am intending t