a thought about barrel replacement. personally i'm all for replacing the barrel, it is already missing its matching scope and rings and matching them back up will be difficult.
i'm not sure about you but personally I have enough toys I can't play with so want my firearms to all be functional.

you may possibly be able to have your cake and eat it too. i'm not sure if this is a sensible or safe idea and I imagine it would be difficult to do correctly, but...

could the original barrel be removed, cut off somewhere in front of the chamber (keeping all of the original markings), be bored out, then internally threaded and a new/NOS barrel turned down and threaded to fit inside. thus ending up with a totally new chamber/bore/crown with the original markings.