My Intention with my Establish is to A) Have a very historic gun with good roll marks, B) Not invest "Colt Dollars" to the undertaking. The "C" within the barrel would point out a chrome chamber only barrel. But AFAIK, Colt marked the "C" up close to the muzzle on https://colt-m16a1-for-sale23333.ltfblog.com/30513235/the-smart-trick-of-colt-combat-elite-commander-45-acp-that-nobody-is-discussing