I think the exterior metal will clean up just fine using WD-40 and some of the bronze wool. A lot of it might just be dried grease. the butt plate appears to have the heaviest pitting.The big question of course is the bore. If it is shootable with good visible lands and grooves, I would venture a guess that $2000.00 to $2500.00 would be a good buy. Anything less would be a real good buy.