The Arisaka Aimpoint Micro Mount Mk2 is designed for Aimpoint Micro T1 and T2 optics and is also compatible with other red dot sights with the same footprint, including 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 has a height of 1.54 inches, which provides a lower 1/3 co-witness with standard AR-height iron sights. This means that the iron sights are visible in the lower third of the red dot optic's lens. AR height iron sights will not be visible through the window underneath the mount in this configuration.