M Series XR Mount 30mm Tube 20 MOA Slope Matte by Nikon Optics now offers the Nikon M Series XR Mount 30mm Tube 20 MOA Slope Matte. The M Series XR Mount 30mm Tube 20 MOA Slope Matte scope mount is specifically designed for AR and MSR rifles. The open piece mount and base design offer the maximum amount of surface area for securing your scope. The rings are extremely strong for the size and weight and will handle all the recoil of a magnum chambering. The Nikon Cantilever mount can be torqued to 65 inch pounds on the rings so your scope will be secured; guaranteed. Specifications and Features: Light weight Very strong Large bearing surface Aluminum construction 30mm Rings