This is the Geissele SOPMOD certified 30mm 1.93" scope mount, ideal for your favorite Nightforce NXS, Vortex HD Gen II, or other low-power variable optic. This mount is ideal for the AR and SCAR platforms where the higher scope mount allows for a more neutral head position and an enhanced eyebox, equating to fast mounting of the rifle and shots on target. This is without a doubt one of my favorite optic mounts and Geissele doesn't fail with their exceptional manufacturing and attention to detail. These mounts are a work of art.