Hey!
My brother has a nice 39-2 nickel. Problem is it was fired and put away after using surplus ball that was corrosive. The inside now looks dark and furry.
I found a decent 59 barrel used for $90. These barrels are the same right?
Looks exactly like his 39 barrel?
The S&W parts list shows the same part numbers (06959) for the barrel in both models. You could call S&W Customer Service to double check compatibility.
Did he give the original barrel a good cleaning? I wouldn't give up on it until cleaned and shot again. Last weekend I was shooting a Gew 98 Mauser rifle made in 1915 with a dark barrel and getting three inch groups at 100 yards with the issue sights.