I tend to agree with Unclenick, though I have seen some pretty bad .45 barrels. Remember that GI ammo was corrosive through about 1952 and I heard a rumor that South Pacific jungles did not improve barrel condition. But a worn out barrel on what looks like a commercial gun seems a bit unlikely; if the only sign is a falling off in accuracy, I think I would look elsewhere for the problem.
Jim
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