My 1920 is a 9mm and has a bore frosted with tiny pits, and the edges of the lands are somewhat rounded. Still, it shoots to point of aim at 25 yards, which is the only distance I have fired it. I have no plan to change this barrel as long as it is functional. In fact, it seems to be a very accurate pistol. As long as there is some definition to the lands, and the chamber is in good condition, the barrel should be fine. A really shot barrel could possibly be lined, but there have been problems with some shops' work.
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