I've RIA drawings specifing barrel markings on a different USGI rifle Which marking is not authorized. The barrel can be a 1970's or 1980's, simply because that's in the event the C FSB was used. The aluminum barrel block markings are regular for just a arsenal rebuild. Despite having the https://finnaayvs.wikinstructions.com/1079064/not_known_details_about_colt_combat_elite_commander_45_acp