That has never been my experience but then, I have never owned a gun that had the barrels "sanded down" by a novice on the outside. Depending on the level of finish you want the barrels to have, i.e., remove any evidence of the barrels having been damaged by the sanding down of exterrior rust and pits, would certainly require more metal to be professionally removed to attain that level of finish would, in my opinion, be inadvisable
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