It will work, I did it with a 997, but I wouldnt do it again, it moved a lot when the water got rough. I dont remember the specific mount # though. If you do it this way youll have the best luck if you drill the mount and rail in a discrete area and put a set screw in to secure it. I have a rail mount on my PIV, but I just keep a spare 788 there when I need it and its secure.