Trijicon RMR/SRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology Black. 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. Distance From Top of Mounting Rail to Optical Axis: RMR: 1.511in SRO: 1.752in NOTE: Torque Spec (to rail): Spring Tension Only: 12-16 in. / lbs. Can be Tightened To: 44-66 in. / lbs. Specifications for Trijicon RMR/SRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology: Manufacturer: Trijicon Color: Black Finish: Matte Black Anodized Fabric/Material: 6061-T6 Aluminum Red Dot Sights-Footprint: RMR Length: 1.8 in Width: 1.7 in Weight: 2.25 oz Included Accessories: 1x Installtion Booklet 1x Hex Key 4x Screws Package Contents: Trijicon RMR/SRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology 1 Mount 2 Optic Mounting Screws 1 Hex Key Trijicon AC32075: RMR/SRO Lower 1/3 Co-Witness Mount w/ Q-LOC Technology Black