Mark,
If it was my gun that needed new barrels, I'd sleeve it myself whether it was a rifle or a shotgun. I have saved back several good chrome moly used barrels for just such an occasion. They were harvested from Beretta shotgun monoblocks that were converted by me to something else, usually a 45/70 or 20 gauge slug gun. Many are beyond help but some good ones can be reused.
Bob