A SECRET WEAPON FOR BCM LOWER

bcn complete lowerAppeared it around so persistently and can't find the blem. Everytime I do think I locate anything off, it is simply oil smudges. Very best guess at this time is scuffs on castle nut, or the two small silver places in the flare from the magwell. 1mm dots at most. BCM QC isn't going to mess all around It appears.Electroless nickel