Unity Tactical Fast Absolute Riser Elevates Absolute Cowitness to 2.26" Optical Height Direct to Picatinny Flat Dark Earth. 26 optical center line. The FAST Absolute Riser provides an elevated M1913 Picatinny platform for direct attachment of optics such as EOTech XPS Leupold LCO and other absolute co-witness optics. It can be paired with any FAST FTC (Flip-to-Center) magnifier mount. It comes standard with a two cross bolt rail clamp but is compatible with the FAST QD (Quick Detach) Lever. If you re running a lower 1/3 co-witness height optic you need the FAST Optic Riser. 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. COMPATIBILITY: All Direct-to-Rail Mounted Optics. Optimized for Absolute Co-witness Height Optics. If you re running a lower 1/3 co-witness height optic you need the FAST Optic Riser. MOUNT TYPE: 2 Cross Bolt Rail Clamp FAST QD Lever Compatible (Sold Separately) Specifications for Unity Tactical Fast Absolute Riser: Manufacturer: Unity Tactical Finish: Anodized Fabric/Material: 7075 T-6 aluminum Attachment Type: Picatinny Length: 3.6 in Height: 2.26 in Weight: 3.5 oz Condition: New Mount Type: Picatinny Package Contents: Unity Tactical Fast Absolute Riser