It does not work on the old single screw sight on the the pre 64 Winchester. You can get a newer back sight, but I opted to send it back. I have the Lyman reciever sight on my muzzleloader and like it, so I plan on getting one for my 94. I also saw on Marbles web sight the same type of sight as the one hole, and it is the whole back sight, not just a piece to fit on your own sight. They call it the Upright Peep.