The Super Precision ACOG Series was developed specifically to work with the Trijicon 4x power ACOG series of optics. These mounts are precision machined from a single piece of 7075-T6 high strength aluminum and are available in both co-witness and lower third co-witness options. They are also available in black type 3 hard coat anodize as well as Geisseles' proprietary DDC (Desert Dirt Color) type 3 hard coat anodize. Utilizing Geissele's update of the classic nut and bolt method, this mount will attach your red dot to your weapon with 1,400 pounds of clamping force, and features 3 shear lugs for maximum rigidity and return to zero. Mfg: Geissele Automatics