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. It provides a lower 1/3 co-witness with backup iron sights. This means that the RMR is mounted higher than the iron sights so that it provides a less cluttered field of view. The iron sights are then in the lower 1/3 of your optical window for backup.Height (from top of mounting rail to optical axis): 1.516"FeaturesFits All Trijicon RMR ModelsSee Through Design (helps keep the mount lightweight and improves field of view)Compatible With Any MIL-STD 1913 Picatinny RailLightweight Rugged Aluminum DesignMatte Black Anodized Finish