Steve,
Not sure why it's not going on. Mine fit on easily enough. However, I took it off after seeing it does nothing for helping hold the scope in place. And, it moves my cheek that much further off the stock, and the scope further away from the barre center line - both things I don't need.
Do you have to have it on the gun, or can you get by just placing the scope mount directly onto the reciever?
Paul.