Beamshot M1 for 3/4 inch Diameter Laser Sight/Flashlight Rail Mount System, Black Mounts to standard 7/8" Weaver base and Picatinny rail without tools Its superior grip withstands repeated recoil For BEAMSHOT 1000, 1001U, 5000, 6000, 6500 and Green Beam 1000, 2000 Laser Sights