Wound Up with that higher and it's chrome bore barrel in the future. I do think It really is an A1E1 from some nomenclature I saw but undecided as I have in no way found One more a single. I figured this was manufactured around the time of product advancement https://goldcuptrophycolt4568899.ouyawiki.com/1081651/top_guidelines_of_colt_combat_unit_rail_gun_45