Consistent check weld pressure and consistent collar bone pressure with the stock lightly touching my neck is very important for semi auto. I’m assuming you already have a good straight back trigger press and hold.Recently built the AR upper with this exact same barrel. Read some similar build questions so here I go.
I built it using criterion core 16” using V7 titanium micro muzzle brake. Headspace BCM bolt with SA carrier.
Gas block is Superlative arms piston clamp on system. Had hard time finding a handguard that won’t touch this gas block so I am going with ergo handguard that has ID of 2.1”
Got lmt lower with sd-e trigger and optic is Swarovski Z5 3.5-18x44
First time I took it out yesterday was able to get good bulls eye accuracy at 100yds but it was not consistent. I wonder if it’s not broken in yet as the OP stated