Monstrum Ruger American Rifles Short Action Picatinny Optic Rail 0 MOA Black. Specifications for Monstrum Ruger American Rifles Short Action Picatinny Optic Rail: Manufacturer: Monstrum Color: Black Finish: Black Fabric/Material: 6061 Aircraft Grade Aluminium Quantity: 1 Gun Make: Ruger Gun Model: Ruger American Rifle Short Action Action Length: Short Action Gun Type: Rifle Length: 7 in Width: 20 mm Weight: 2 oz Fit: RCVR Gun Rail: Picatinny Features of Monstrum Ruger American Rifles Short Action Picatinny Optic Rail The Picatinny rail section installs directly to the factory mounting holes in the Remington American Rifles via the included set screws. The rail sections are compatible with both Picatinny and Weaver based rings and optics. 7 inches or 16 rail slots in length the rail allows for flexible placement of your optic for optimum eye relief and cheek weld. Available in two styles - a 0 MOA mount and a 20 MOA mount. Center Bolt Distance: 3.01 in Rear Bolt Distance: 0.87 in Front Bolt Distance: 0.87 in Package Contents: Monstrum Ruger American Rifles Short Action Picatinny Optic Rail Monstrum RM171: Ruger American Rifles Short Action Picatinny Optic Rail 0 MOA Black