The AD-MRO-11 mount is designed for the Trijicon Miniature Rifle Optic that places the optic in a Lower 1/3rd Co-Witness height. It is precision machined from 6061 T6 aluminum and finished in hard coat T3 Mil-Spec anodize. It features the Patented QD Auto Lock Lever system to accommodate both in spec and out of spec rail systems. ADM Trijicon MRO 1/3 Co-Witness Std Lever FDE Mount