Brownells Is making use of an A1 forging as well, It truly is pretty popular expertise that they're utilizing forgings created by Nodak Spud. Not sure where you are obtaining your assumptions from. The barrel is a 1970's or 1980's, because that may be if the C FSB was used. https://goldcuptrophycolt4512222.bcbloggers.com/30665575/the-fact-about-colt-combat-unit-rail-gun-45-that-no-one-is-suggesting