Monstrum Grimlock Winchester SXP/Defender / 1300 Picatinny Rail Mount RMR Footprint Black. All with the same functionality and reliability as standard optic mounts. The Winchester SXP / Defender / 1300 red dot mount is a dedicated optic mounting base compatible with the Winchester SXP / Defender / 1300 shotgun platforms. Not compatible with other shotgun models. For direct mounting of your red dot onto your shotgun receiver. Available in RMR Venom/Docter or RMSc footprint standards. Please view compatibility chart to verify the compatibility of your red dot before purchasing. 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 Grimlock Winchester SXP/Defender / 1300 Picatinny Rail Mount: Manufacturer: Monstrum Color: Black Gun Make: Winchester Gun Model: Winchester SXP Defender Gun Type: Rifle Fabric/Material: 6061 Aircraft-Grade Aluminum Red Dot Sights-Footprint: RMR Length: 5.75 in Width: 1.3 in Height: 0.5 in Weight: 1.2 oz Features of Monstrum Grimlock Winchester SXP/Defender / 1300 Picatinny Rail Mount Dedicated red dot mount built specifically for Winchester SXP / Defender / 1300 shotgun platforms. Not compatible with other shotgun models. Please view compatibility chart to verify the compatibility of your red dot before purchasing. Grimlock Series optic mounts offer a sleeker and more distinctive design than previous generation mounts contoured to the curvature of your receiver. Installs directly into the factory mounting holes on your shotgun receiver using the included set screws. Package Contents: Monstrum Grimlock Winchester SXP/Defender / 1300 Picatinny Rail Mount Monstrum ZD740R: Grimlock Winchester SXP/Defender / 1300 Picatinny Rail Mount RMR Footprint Black