Looking nice! If I may ask, how did you polish the entire barrel?
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I only polished the feed ramp, barrel hood, and the muzzle. I use 1500 grit wet sandpaper soaked with WD-40 to take most of the coating off, then finish with Mothers metal polish and a hard felt tip on a Dremel at low speed. I polish the internals the same way after stoning where necessary.