With the increasing number of electro optics being used finding a compatible mounting system can be confusing. We designed our modular Red Dot Riser to fit a wide range of different optics based on the mount footprint. This Reflex Sight Riser is designed to offer easy height adjustments with the included spacer allowing the user to dial in the perfect height for their optic and rifle combination. All riser mounts that we offer share a robust mounting base while the top is engineered specially for different red dot styles. All risers include a 0.180″ thick spacer. Fits: Burris Fast Fire 2 & 3 CMORE RTS & STS Doctor Eotech MRDS Holosun 507c/407c V1 507c/407c V2 Insight MRDS Leupold Delta Point & Delta Point Pro Shield RMS Sig Romeo 3 3 Max 3 XL Trijicon RMR TrueGlo UTG Reflex Micro Dot Vortex Razor Venom Vortex Viper.