I was questioning a similar matter. Minimal amp TIG welding might be the answer to just welding the roll marks. What's the perpose of copper? I assumed that element was exciting considering I had heard the colt handguards were good quality. I have owned quite a few M16's in each https://charlesb186mli2.wikikali.com/979641/colt_combat_elite_commander_45_acp_for_dummies