I was asking yourself precisely the same issue. Low amp TIG welding may be the answer to simply welding the roll marks. What is the perpose of copper? The "C" over the barrel would suggest a chrome chamber only barrel. But AFAIK, Colt marked the "C" up near the muzzle https://bookmarktiger.com/story18459556/top-latest-five-colt-combat-elite-commander-45-acp-urban-news