Leupold 170351 RM Ruger M77 1" Medium Matte Ringmount Leupold’s Ruger M77 Scope Mounts deliver a rock-solid interface between your rifle and optic. Available in 1-inch, 30mm, and 34mm ring diameters and in a wide assortment of heights, these rings are compatible with the majority of Ruger M77 Rim Fire Rifles with an 11mm, 13mm, or 3/8” dovetail rail, and are precision machined from solid steel for greater integrity and tighter tolerances. Leupold RM Ruger M77 1" Medium Matte Ringmount 170351