On the subject of rust bluing, I just got a set of barrels back from a gunsmith, and one of the chambers is covered in a rough residue, While the other is polished smooth as it should be. Perhaps one of our resident gunsmiths could comment on what that residue is likely to be and how someone like myself might be able to remove it.
And I checked as soon as I read the post about the barrel flats. He left mine blued.
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