The Warne 1R7M Scope Rings are Custom Matched to Your Ruger Rifle or Pistol The Ruger scope mounting system uses a proprietary rail that requires matched scope rings. The Warne 1R7M Ruger rings are matched for fit and height for the M77 and Hawkeye rifles, and the Ruger Super Redhawk pistol. The 2-piece ring set features rings of differing height to match the taper of the receivers. There is no guess work required. The split ring design can handle the recoil of the heaviest loads from either a rifle of handgun. Warne 1R7M Ruger M77 Scope Rings Specifications and Features Warne Item Number 1R7M Ruger M77/Hawkeye/Super Redhawk Scope Rings 1" Diameter, Medium Height Vertically Split Mounts with T-15 Torx Style Screws 25 in/lb of Torque Recommended Attaches to Ruger Proprietary Dovetail Matte Black Finish