The Vortex Cantilever Mount is designed to mount optics with a 1" tube on flattop receivers. Available with a 2" or 3" extension to mount the scope in a forward position for the ideal eye relief and head position on style rifles. This unit features integral 1 inch, 4-hole rings and a torque screw picatinny-style mount . The superior clamping surface area provides a sure hold on Picatinny-style rail that may even be somewhat out of spec. The mount is CNC machined from solid 6061-T6 aluminum and features a hard coat Type 3 Mil-spec anodizing for a lifelong lasting finish.