Colt Verified Proof V&P In triangle marking on remaining aspect of the barrel in between the legs with the front sight foundation: The "C" around the barrel would indicate a chrome chamber only barrel. But AFAIK, Colt marked the "C" up close to the muzzle on their own early barrels, https://rafaelwskvv.pages10.com/the-smart-trick-of-colt-combat-elite-commander-45-acp-that-no-one-is-discussing-66767350