Unity Tactical FAST MRO Mount System. The Unity Tactical FAST MRO Mount System was designed to give the user with a quicker sight picture than standard height mounts. It was made specifically for the Trijicon MRO series, and creates a 2.26? Optical center line from the rail and provides faster/easier dot/reticle acquisition while wearing night vision goggles, gas masks, plate carriers, and other gear. FAST mounts allow for more rapid visual processing of the battlefield by promoting a heads up posture. It features a built in, fully adjustable rear back up iron sight. The built in rear BUIS is fully compatible with a standard front sight for a traditional sight radius. The FAST MRO Mount can also be fitted with a Quick Detach Lever, and has a Black finish. 2.26 to Optical Center Line. 2 Cross Bolt Rail Grabber or QD. Type III Hardcoat Anodized. 2.08″ (L) x 1.2″ (W) x 81 (H).