Sleeving, or any gun work can be a very personal matter in total disregard to economics. I recently had a "O" frame Parker 16 gauge hammergun with rotten barrels sleeved and rechambered to 20 gauge 32" barrels by Brad Bachelder. Now I have a 20 gauge Parker with long barrels. It's very cool to shoot, but I'd probably never be able to recoup my investment.