Steve Donlon
Gold $$ Contributor
That makes sense if you have a premium barrel. I learned the value of a borescope so I can stay ahead of those issues. The AR barrel I was given, I did not think it was possible to get a barrel that black with carbon and not know it. When I got all the carbon out, there was no fire cracking. I guess with a 2 moa $60 barrel maybe the carbon protected the barrel.Frank is definitely not in favor of using abrasive with brushes. Patches only.