Red dot mount for the Aimpoint COA optic with Spuhr's patented flip functionality, allowing the optic to be flipped aside. Lower-1/3 co-witness height of 39mm/1.53 inch for Picatinny rails. Compatible with the RDM-20153 magnifier yoke (sold separately). Length 63.4mm/2.5 inch, weight 119g. Optic not included.