Warne Scope Mounts 20MOA Ruger American Centerfire Short Action Tactical Rail, Black Warne Ruger American Center fire Short Action Tactical Rail w/20MOA Constructed of solid steel and machined in both standard and 20MOA configurations Cross slots feature the 1913 Mil-Spec design Bases securely mount to your gun with T-15 Torx style screws, 25 in/lb. of torque recommended Warne Tactical Bases allow the use of Picatinny or standard Weaver style rings