montana Wrote:What torque value did you use on the barrel nut?-Don't recall the torque off the top of my head, it's not super-ultra-mega tight. I think I remember putting it to the lower end of spec because I lubricated the receiver threads.
Did you lap your upper receiver face?
Does your barrel crown look good?
Did you head space your barrel/bolt combination?
Is your optic and optic mount solid?
Is your hand guard free float?
Does the hand guard touch the gas block when pressure is applied to the end of it?
Does the firing pin strike the center of the primer or is it off set?
-Receiver was lapped and the barrel extension bedded in with sleeve retainer.
-Barrel crown looks new,/undamaged.
-I don't exactly know what your mean by headspacing the barrel/bolt. I had a bolt from a bear creek upper that I was using, recently replaced it with an Ultrabolt, didn't notice a significant accuracy change.
-optic mount is solid.
-Yes, free floating, no contact with gas block.
-slightly off center, pic attached.[ATTACH=CONFIG]19981[/ATTACH][ATTACH=CONFIG]19982[/ATTACH]