Monstrum Winchester SXP/Defender / 1300 Grimlock Picatinny Rail Mount Black. All with the same functionality and reliability as standard optic mounts. The Winchester SXP / Defender / 1300 picatinny rail mount is a dedicated optic mounting base compatible with the Winchester SXP / Defender / 1300 shotgun platforms. 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 Winchester 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 Winchester SXP/Defender / 1300 Grimlock Picatinny Rail Mount: Manufacturer: Monstrum Color: Black Gun Make: Winchester Features of Monstrum Winchester SXP/Defender / 1300 Grimlock Picatinny Rail Mount Dedicated picatinny rail mount built specifically for Winchester SXP / Defender / 1300 shotgun platforms. Not compatible with other shotgun models. 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. No additional hardware required. Package Contents: Monstrum Winchester SXP/Defender / 1300 Grimlock Picatinny Rail Mount Monstrum RM740: Winchester SXP/Defender / 1300 Grimlock Picatinny Rail Mount Black