Trijicon MRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology Black. This means that the MRO 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: 1.66 in NOTE: Torque Spec (to rail): Spring Tension Only: 12-16 in. / lbs. Can be Tightened To: 44-66 in. / lbs. Specifications for Trijicon MRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology: Manufacturer: Trijicon Color: Black Fabric/Material: 6061-T6 Aluminum Red Dot Sights-Footprint: MRO Optic Cut: Not Applicable Length: 1.66 in Width: 1.8 in Condition: New Included Accessories: 1x Installation Booklet 1x Mount 1x Hex Key 4x Screws Features of Trijicon MRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology: QUICK-RELEASE RETURN-TO-ZERO: Multiple proprietary recoil lugs ensure total rail engagement. Easily remove and re-attach without needing to confirm zero. AUTOMATIC RETENTION KEEPS OPTIC SECURE: Heavy-duty springs ensure secure retention under heavy repeated recoil. Facilitates one-handed mounting. SNAG-RESISTANT KNOB DESIGN: Compact circular design minimizes hazards of gear snags. PRECISION-CUT DIMENSIONS: Ensures optimal placement on MIL-STD 1913 NATO non-mil spec and even damaged rails. PROVEN DURABILITY: Machined from 6061 aluminum for outstanding repeatable performance. Package Contents: Trijicon MRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology 1 - Mount 4 - Screws 1 - Hex Key 1 - Installation Booklet Trijicon AC32071: MRO Lower 1/3 Co-Witness Mount w/ Trijicon Q-LOC Technology Black AC32071