I found several versions when I looked. Some have been marked M-16A1, plus some were marked M16A1. Some experienced SERIAL actually stamped on there prior to the serial number, and Some others did not. You are going to get an email just about every Friday early morning showcasing the most https://colt-m16a1-for-sale22222.lotrlegendswiki.com/1083056/the_smart_trick_of_colt_combat_elite_commander_45_acp_that_no_one_is_discussing