Ruger American Rimfire tactical picatinny scope rail mount This mount fits: Ruger American Short Action Models Ruger American Standard (Short Action Calibers) Ruger American Predator (Short Action Calibers) Ruger American Compact (Short Action Calibers) Ruger American Ranch (Short Action Calibers) Ruger American Go Wild Camo (Short Action Calibers) Made of black alloy. Mounting Hardware Included. I have 222 Loctite listed and its recommended to use on the screws.