The Leupold Mark 2 Integrated Mounting System (IMS) cantilever design mounts directly to your rifle's mil-spec 1913 / picatinny rail to raise the scope and push it forward eliminating the need for risers and specialized optics with shortened eye relief. All Leupold IMS products are tested to endure the rigors of the field and are covered by Leupold's full lifetime guarantee. Made from 6061-T6 aluminum alloy, hard coat anodized finish.