LaRue Tactical RMR Adapter Ring Half Black. Simply replace one side of a set of rings with this upgrade and attach the RMR. The canted angle makes it easier to locate the dot as it places the dot relatively close to the primary optics height over bore as you rotate the rifle. Reversible to work on either left or right side. Comes complete with Mounting hardware QD adjustment wrench and Instructions. Specifications for LaRue Tactical RMR Adapter Ring Half: Manufacturer: LaRue Tactical Color: Black Red Dot Sights-Footprint: Holosun K Optic Cut: Not Applicable Last Chance: Yes Package Contents: LaRue Tactical RMR Adapter Ring Half LaRue Tactical LT742: RMR Adapter Ring Half Black