Exclusively from Monstrum - the Grimlock Series optic mounts offer a sleeker and more distinctive design than our previous generation mounts, contoured to the curvature of your receiver. All with the same functionality and reliability as our standard optic mounts. Installs directly into the factory mounting holes on the Ruger 10/22 receiver using the included set screws. No additional hardware required Available in RMR, Venom/Docter, or RMSc footprint standards. Please view compatibility chart to verify the compatibility of your red dot before purchasing. Includes: Ruger 10/22 Red Dot Mount, Screws Materials: 6061 Aircraft Grade Aluminum Compatibility: Ruger 10/22 Weight: 1.1 oz Length: 4 in Width: 1.2 in Color: Black Warranty: Lifetime