Jani,
I wholeheartedly agree with that. That is precisely why I put the caveat " properly hand polished" in. If you buy a drilling with a scope in clawmounts with soldered in bases; the barrels have been reblued, and you can't tell it. For a while some were glued(2 component glue)precisely to avoid rebluing. I understand they sometimes came loose, later.
Mike