When inspecting a used barrel for potential purchase, I know about general things such as looking at the bore and whether the bore is bright and the rifling in good shape. I see many folks check the muzzles for wear and counterbore. What other things might be important? If a barrel has been relief cut on a lathe, will it be readily apparent or should I measure the shoulder in some way? Is there a maximum amount that can be removed from the shoulder and still be serviceable? What about the firing chamber? Can tool marks from removal be cleaned up? I always worry that I will overlook something, and that if the barrel were OK it would still be on the rifle.
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