The Leupold Integral Mounting Systems (IMS) family quickly and easily eliminates the two most common issues faced when mounting standard riflescopes to AR-style rifles; scope height and eye relief. From the Mark 1 to the Mark 4, each aluminum IMS cantilever design mounts directly to the firearms Mil-Spec 1913/Picatinny to raise the scope and push it forward, eliminating the need for risers or specialized optics with shortened eye relief. The Mark 1 Rail slides into place and the living hinge easily clamps to the rifle with two Torx T-15 screws, providing an affordable and easy-to-use alternative to risers that do not push the scope forward.