Unity Tactical FAST AEMS Mount. The Unity Tactical FAST AEMS positions Holosun AEMS optics at a 2.26? Optical centerline from the rail. It comes standard with a two cross bolt rail clamp, but is compatible with the. FASTTQD (Quick Detach) Lever. It can be paired with any FASTT FTC (Flip-to-Center) magnifier mount. FAST is a series of optic mounting solutions that provides end users with a quicker sight picture than standard height mounts. FAST 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 acquisition while wearing night vision goggles, protective masks, plate carriers and other gear. 2.26 Optical Centerline. 2 Cross Bolt Rail Clamp. Dimensions (W x L x H). Type III Hardcoat Anodized.