The Patent Pending Arisaka Aimpoint Micro Mount Mk2 is designed for the Aimpoint Micro T1 and T2 optics, and will also function with other red dots using the same footprint, including the Aimpoint H1/H2, Aimpoint Comp M5/M5S, Sig Romeo 4 and 5, Vortex Crossfire, and Holosun HS503/515/530. The Arisaka Aimpoint Micro Mount Mk2 is available in 1.54", 1.93", and 2.26" heights. 1.54" is considered lower 1/3 co-witness, meaning standard AR height iron sights are visible in the lower 1/3 of the red dot optic lens. 2.26" matches up with the Unity FAST FTC Magnifier Mount. AR height irons sights are visible through the window underneath the optic only with the 2.26" Aimpoint Micro Mount Mk2.