The Monstrum Tactical Ruger 10/22 Picatinny Rail Mount is built for Ruger 10/22 rifles. It allows for the mounting of Picatinny or Weaver standard scopes, red dots, magnifiers, or other optics. The rail installs via the included set screws into the Ruger 10/22 factory mounting holes. Includes: Ruger 10/22 Picatinny Rail Mount, Screws Materials: 6061 Aircraft Grade Aluminum Compatibility: AR-15, Rifles with Picatinny rails Weight: 1.3 oz Length: 4.5 in Color: Black Warranty: Lifetime