Depends on how far you want to go . Full restoration will cost more than a blueing or blacking with out polishing and pitting removal if it has pitting .Where can you get a whole rifle reblued for 100 ?
If I need to get mine done again I'm going to get andrew to bead blast it and black it.Yep Andrew does a top job ..
He has done bits and pieces for me with great results .
A price from him would have to be got once sanding and polishing is involved ..
,)
@Sim get the 80 logged on for sale at the price your after.. ,)
Think thread has given a fair idea..
Good luck with sale