The company I used and liked was Laib's Gunsmithing in Spicer, MN . 320-796-2686. Having owned 3 3200's over the years you might want to replace P/N 90343, toggle block, also. It is the part that the selector screw screws into. It was a non-metal part that sometimes splits at the threaded hole and allows the block to "drift" so to speak and causes either barrel to fire, not the selected one. The 3200 only does this when trying to sell the gun!! LOL. Laib's can give you better advise than I on that.