Just Lately I've found Numerous uppers that happen to be get offs from rebuilt M16A1 rifles being sold as "new alternative uppers". The barrel is often a 1970's or 1980's, mainly because that may be if the C FSB was applied. The aluminum barrel block markings are typical for the https://socialimarketing.com/story4012468/not-known-facts-about-colt-combat-unit-rail-gun-45