Thanks for the replies. I decided that the headspace was probably bad so I attempted to to fix it. Got it right on the first refit. :happy: now I'm not scared to field test it when the time comes.
As a side note, but somewhat related, when you guys mate barrel components to a virgin barrel what's the step by step you use? Seemed to me the best idea was to get the hs the way I wanted it, install the barrel pin and then pressing on everything. If I didn't do the pin I think it would shifted as I pressed the rsb, correct?