The FAST(TM) AEMS positions Holosun(TM) AEMS(TM) optics at a 2.26a ^2 optical centerline from the rail. It comes standard with a two cross bolt rail clamp, but is compatible with the FAST(TM)QD (Quick Detach) Lever. It can be paired with any FAST(TM) FTC (Flip-to-Center) magnifier mount. FAST(TM) is a series of optic mounting solutions that provides end users with a quicker sight picture than standard height mounts. FAST(TM) mounts create 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 acqui Mfg: Unity Tactical