The Trijicon RMRcc Footprint Quick Release Lower 1/3 Co-Witness Mount with Trijicon Q-LOC Technology features a Mil-Spec drop test rated 6061-T6 aluminum design, with an easy to use one handed tool less mounting system. This Return to Zero mount boasts a low weight and low profile design, compatible with any Picatinny rail. Designed specifically for the Trijicon RMRcc. This lightweight Lower 1/3 Co-Witness mount is perfect for mounting a Trijicon red dot using the RMRcc footprint on any rifle platform with a Picatinny rail. The AC32111 provides a Lower 1/3 Co-Witness with backup iron sights. This means that the RMRcc(R) 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.