FACTS ABOUT BCM LOWER RECEIVER REVEALED

bcn complete lowerLooked it above so persistently and can't discover the blem. Everytime I believe I come across something off, it is just oil smudges. Greatest guess at this stage is scuffs on castle nut, or The 2 very small silver places during the flare from the magwell. 1mm dots at most. BCM QC isn't going to mess all over it seems.Wonderful lo