A SECRET WEAPON FOR BCM LOWER

bcn complete lowerLooked it in excess of so many times and may't discover the blem. Everytime I do think I find a thing off, it is simply oil smudges. Best guess at this point is scuffs on castle nut, or the two small silver places during the flare of the magwell. 1mm dots at most. BCM QC isn't going to mess all around It appears.Electroless nickel