The FAST Absolute Riser securely elevates block-type red dot optics with an absolute co-witness height to a 2.26" 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. The FAST Absolute Riser is built from 7075-T6 Aluminum and is Type III Hardcoat Anodized in Black or FDE. Features of Infinite Defense UNITY FAST ABSOLUTE RISER: Elevates block-type red dot optics with an absolute co-witness height to a 2.26" optical center line Provides an elevated M1913 Picatinny platform for direct attachment of optics Can be paired with any FAST FTC (Flip-to-Center) magnifier mount Creates a 2.26" optical centerline from the rail Built from 7075-T6 Aluminum Type III Hardcoat Anodized Package Contents: Infinite Defense UNITY FAST ABSOLUTE RISER