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. Compatible with: Most drilled and tapped Shotgun models including Mossberg 500/590/835/930/Shockwave Remington 870 Express Tactical Winchester SXP Defender / 1300 Benelli M1/M2/M3 Super Black Eagle I/II Stoeger M3000/M3500 Remington 7400/7600 Franchi Affinity 3/3.5 Weaver 93 drill hole pattern Many drilled and tapped 22lr and short action rifle models including: Ruger 10/22 Marlin 336/1894/1895 Lever Action Henry Big Boy Lever Action 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. Includes: Red Dot Shotgun Mount, Hardware Materials: 6061 Aircraft Grade Aluminum Compatibility: Multiple Shotguns Red Dot Footprints: RMR or RMSc Screws: #8-40 and #6-48 in multiple lengths Weight: 1.2 oz Color: Black Warranty: Lifetime