Is it pitted and rusty or just smooth? I am also wondering if it hasn't been used with cast lead bullets which MAY fill in the grooves to give it a smooth(er) look. It would take a lot of shooting to shoot out a bore. Or metal cleaning rod use from the front of the gun could also wear it near the muzzle.
Does the overall gun show a lot of use?
If the rest of the gun is orig, including finish, I would not consider changing the barrel or relining it. If the gun is all original but the bore is worn it will hurt the value a bit, bit not as much as changing something that will effect collectability.
Go to your gun shop and buy a stainless steel bore brush and scrub a bit to see if it cleans, if lead flakes out, etc.
Lots of our favorite and accurate Luger shooters have suspect looking bores.
dju
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