Kinetic Development Group Sidelok Trijicon RMR Mount Absolute Co-witness Black. The lightweight 3.4 oz mount pairs with all models of RMR to carry an overall weight of 4.4 oz assembled. Made from high strength 6061-T6 aluminum the Sidelok mount allows for instant attachment or detachment of the optic to the firearm. This is facilitated with no tools or adjustments can be accomplished with one hand even while wearing gloves and with 100percent repeatable return to zero The RMR Sidelok is perfect for lightweight firearms and those that swap optics out for different shooting environments. Specifications for Kinetic Development Group Sidelok Trijicon RMR Mount Absolute Co-witness: Manufacturer: Kinetic Development Group Finish: Black Anodized Red Dot Sights-Footprint: RMR Optic Cut: Not Applicable Length: 2.686 in Height: 9 in Weight: 3.4 oz Additional Features: Absolute Co-Witness Features of Kinetic Development Group Sidelok Trijicon RMR Mount: Width: 1.10in Absolute Co-witness Compatibility: Trijicon RMR Red Dots or other compatible Red dots utilizing RMR style mounting base Package Contents: Kinetic Development Group Sidelok Trijicon RMR Mount Absolute Co-witness Kinetic Development Group SID5-230: Sidelok Trijicon RMR Mount Lower 1/3 Black