The FAST™ Comp Series Mount places full size Aimpoint Comp Sights at 2.26″ optical center line above weapon rails. It is the perfect mount for the standard issue U.S. Army M68 CCO series. It will also accept legacy Comp and Comp-style sights in Aimpoint’s 30mm Top Ring Mount such as the Patrol Rifle Optic (PRO) and Aimpoint Carbine Optic (ACO).