The high price of most Model 21 barrel jobs is the removal and resoldering of both top and bottom ribs as well as reattachment of the lug and rebluing the barrels. I have a vent rib gun that needs it all. I think the gun gave good service until the ribs came a bit loose. It was built for a Winchester Pro in 1939 and probably hasn't been serviced since. I would assume it has a serious number of rounds through it.