Developed as a solution for the DOD's standard issue M68 CCO, the Unity Tactical FAST Comp Series is a drop-in replacement for all full-size Aimpoint Comp series and PRO optics. It comes standard with a two cross bolt rail clamp, but is compatible with the FAST QD Lever. It can be paired with any FAST FTC magnifier mount. Features2.26" Height to Optical Center Line2 Cross Bolt Rail ClampType III Anodized