The Trijicon RMRA(R)/SRO(TM) Lower 1/3 Co-Witness Quick Release Mount with Q-LOC(TM) Technology features a Mil-Spec drop test rated 7075-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 RMR. This lightweight Lower 1/3 Co-Witness mount is perfect for mounting the RMR on any rifle platform with a Picatinny rail. The AC32075 provides a Lower 1/3 Co-Witness with backup iron sights. This means that the RMR/SRO 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.a Matte Black Anodized Finisha Made in the USA