The Trijicon RMR Lower 1/3 Co-Witness Mount Quick Release features an aluminum design and a matte black anodized finish. It is easy to use with a one-handed, tool less mounting system. This lightweight low mount is perfect for mounting the Trijicon RMR on any weapon platform with a Picatinny rail that requires a low optical height. This would include a shotgun, .22 rifle, AK or pistol platform. The RMR is mounted higher than the iron sights resulting in a clearer field of view. The iron sights remain visible in the lower 1/3 of your optical window for use as a backup. Specifications: Trijicon RMR Quick Release Lower 1/3 Co-Witness Mount AC32075