I Used to be thinking exactly the same thing. Low amp TIG welding may very well be The solution to simply welding the roll marks. What's the perpose of copper? Sure, I'm sure the upper receiver is Colt, combined with the BCG. It is de facto the barrel that is https://archerxlyxt.blogkoo.com/top-guidelines-of-gold-cup-trophy-colt-45-50839317