The FAST Optic Riser securely elevates direct-to-rail mounted red dot optics with a standard lower 1/3 co-witness picatinny mount to a 2.26 optical center line. The FAST Optic Riser provides an elevated M1913 Picatinny platform for direct attachment of optics, such as EOTech EXPS, Vortex UH-1 and other lower 1/3 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 FASTQD (Quick Detach) Lever (as of Aug. 2023).Specifications and Features:Model: Fast Optic RiserMaterial: AluminumPieces: 1Mount Type: Picatinny RailLength: 3.60"Rings Included: No