Have a stag 10 build on the go...NEWBIE...Faxon 20" pencil barrel and PSA P10 nitride BCG....how important is head space check on these 2 components? I read the faxom is done well but not sure...as I said, new at this. Might be one time build and have not found a quick source for go nogo gauges. Also have a question about how much barrel torque on an aim sports barrel nut for the faxon barrel.