Monstrum Grimlock Universal Red Dot Mount Compatible w/ Drilled and Tapped Mossberg/Remington/Winchester/Weaver 93 Pattern Shotgun Models Black. Available in RMR or RMSc footprint standards. Not compatible with other red dot models. Please view compatibility chart to verify the compatibility of your red dot before purchasing. With slots that accommodate multiple drill hole patterns plus a complete set of commonly used drill hole screws. Installs directly into the factory mounting holes on the receiver using the included set screws. Recommended torque specs: 15 in/lbs. Includes both #8-40 and #6-48 screw sets in multiple lengths for compatibility across different makes and models. Specifications for Monstrum Grimlock Universal Red Dot Mount: Manufacturer: Monstrum Color: Black Features of Monstrum Grimlock Universal Red Dot Mount Exclusively from Monstrum - the Grimlock Shotgun Red Dot Mount comes with a Universal Mounting System designed to secure to most popular drilled and tapped shotgun models with a dedicated red dot base for direct mounting of your red dot onto your preferred shotgun receiver. Not compatible with other red dot models. Please view compatibility chart to verify the compatibility of your red dot before purchasing. With slots that accommodate multiple drill hole patterns plus a complete set of commonly used drill hole screws the Grimlock mount is compatible with the following shotgun models: Mossberg 500/590/835/930/Shockwave / Remington 870 Express Tactical / Winchester SXP Defender / 1300 / M1/M2/M3/Super Black Eagle / Stoeger M3000/M3500 / Weaver 93 drill hole pattern. Includes both #8-40 and #6-48 gunsmithing screw sets in multiple lengths for compatibility across different makes and models. Installs directly into the factory mounting holes on the receiver using the included set screws. Recommended torque specs: 15 in/lbs. Package Contents: Monstrum Grimlock Universal Red Dot Mount Monstrum ZD770R: Grimlock Universal Red Dot Mount Compatible w/ Drilled and Tapped Mossberg/Remington/Winchester/Weaver 93 Pattern Shotgun Models Black