Monstrum Remington 870 Shotgun Series Picatinny Rail Mount Black. All with the same functionality and reliability as standard optic mounts. The Remington 870 picatinny rail mount is a dedicated optic mounting base compatible with factory drilled and tapped Remington 870 shotgun platforms. Note that only certain Remington 870 models come drilled and tapped from the factory. Other models will require drill and tapping by a gunsmith. Not compatible with other shotgun 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 receiver using the included set screws. No additional hardware required. Rail is 4.5 inches or 11 picatinny rail slots in length. Specifications for Monstrum Remington 870 Shotgun Series Picatinny Rail Mount: Manufacturer: Monstrum Color: Black Gun Make: Remington Features of Monstrum Remington 870 Shotgun Series Picatinny Rail Mount Dedicated optic mounting base compatible with factory drilled and tapped Remington 870 shotgun platforms. Note that only certain Remington 870 models come drilled and tapped from the factory. Other models will require drill and tapping by a gunsmith. Grimlock Series optic mounts offer a sleeker and more distinctive design than previous generation mounts contoured to the curvature of your receiver. Can be used to mount red dots or optics using the Picatinny 1913 or the Weaver mounting standard. Installs directly into the factory mounting holes on your shotgun receiver using the included set screws. Package Contents: Monstrum Remington 870 Shotgun Series Picatinny Rail Mount Monstrum RM780: Remington 870 Shotgun Series Picatinny Rail Mount Black