Whatever you do with it you will have to regulate it, lining it would save a lot of work.

I meen the procedure when the barrels are drilled out and a new barrel are inserted into the old ones. You will have to take the ribs off when soldering the liners and reatatch them afterwards, regulate and reblue.

Its a long way from building a new set, even using the old lump to sleeve a new set of barrels into.

Sleeving in uk means lining in the us, or is it the other way