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 the 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.