RAI adapter for the 13xx, 22xx, 24xx series guns will not fit the Prod pistol without having to drill the 2 rear breech hold down screw holes in the adapter. The 13xx, 22xx, 24xx adapter uses one threaded hole 180 degrees apart on top and bottom of adapter. The Prod use one threaded hole in the center on the bottom and 2 threaded holes on top about 1/4" either side of center. Holes are at a sharp angle in the side of adapter so fairly difficult to drill them in correct locations but not impossible.BD