The Geissele Automatics Super Precision ACOG Series works specifically with the Trijicon 4x power ACOG series of optics. These mounts are precision machined from a single piece of 7075-T6 high strength aluminum. Black Type 3 hard coat anodize. Attaches your ACOG to your weapon with 2,800 pounds of clamping force via Geissele?s update of the classic nut and bolt method Includes 3 shear lugs for maximum rigidity and return to zero.