The Mark AR Rail Mount is an aluminum one-piece base designed to fit any Picatinny rail and raise your mounting platform. Leupold’s tactical Mark AR family of mounts gets your scope to the right height and eye relief while providing one of the most rock-solid mounting solutions in the business. These mounts feature a five-bolt design with three recoil lugs to withstand any abuse you can throw at them. So don't leave your rifle system's accuracy to chance.