The FAST PRO Mount positions the Aimpoint Patrol Rifle Optic (PRO) Red Dot Reflex Sight at a 2.26" optical centerline from the rail.It is also compatible with other optics of industry standard 30mm footprint. It features a built-in, fully adjustable rear back-up iron sight that is compatible with a standard front sight for a traditional sight radius. Very compact, it covers only three slots on an M1913 Rail. It comes standard with a 2 cross bolt rail clamp and can be paired with any FAST FTC (Flip-to-Center) magnifier mount.FAST is a series of integrated optics and optic mounting solutions that provides end users with a quicker sight picture than standard height mounts. FAST mounts position most optics at a 2.26" optical centerline from the rail, which allows for more rapid visual processing of the battlefield by ensuring an ergonomically correct heads-up posture. Further, they provide faster and easier dot/reticle acquisition while wearing night vision goggles, protective masks, pl...