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. The Ruger 10/22 picatinny rail mount is a dedicated mount built specifically for the Ruger 10/22 platform. Not compatible with other rifle models. Can be used to mount scope rings, mounts, or optics using the Picatinny 1913 or the Weaver mounting standard. Installs directly into the factory mounting holes on the Ruger 10/22 receiver using the included set screws. No additional hardware required. Rail is 4.5 inches or 11 picatinny rail slots in length Includes: Ruger 10/22 Picatinny Rail Mount, Screws Materials: 6061 Aircraft Grade Aluminum Compatibility: AR-15, Rifles with Picatinny rails Picatinny Slots: 11 Slots Rail Height: 0.50 in Weight: 1.1 oz Length: 4.75 in Width: 1.02 in Color: Black Warranty: Lifetime