A judicious use of a hone combined with a barrel wall gauge can improve pitted barrels dramatically. Similarly, external pitting can be draw filed off if you are careful. I just picked up two really nice British guns that appear to have been left in cases, both having excellent bores but substantial pitting on the exterior of the tubes, both guns had plenty of wall thickness, had not been refinished in the past and look far better after draw filing. The remaining pitting will be filled with micro welding. I fall into the category of endorsing careful work if possible as opposed to leaving the pitting in place, others may view things differently.
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