BCM LOWER COMPLETE - AN OVERVIEW

bcn complete lowerAppeared it in excess of so many times and can't find the blem. Everytime I believe I uncover a thing off, it is simply oil smudges. Best guess at this point is scuffs on castle nut, or the two tiny silver spots within the flare in the magwell. 1mm dots at most. BCM QC will not mess all around It appears.The Mk2 upper receiver mov