Operate issue:  Over the 3rd round I get a light hammer strike.  I've tried out equally H2 and H3 buffer weights.  H2 I was only acquiring one particular shot, H3 I now get two photographs off.  I've attempted this on two uppers, a person carbine and just one pistol, but using the very same BCG.  I ordered an aimsurplus NiB BCG, I'm intending