The AD-68 Standard Height Aimpoint mount features an absolute co-witness ( co-witness near center of optic ) when used on an AR15, M16, M4 flat top with Mil-Spec size iron sights. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems.