*The M3X Magnifier with Flip Mount Combo will allow operators to seamlessly transition *The VRD501 Red Dot Sight Features tough construction with a compact and lightweight form-factor*With 2 included riser spacer, the M3X magnifier can be aligned with absolute Co-WitnessThe VRD501 is a 20mm micro optical sight designed for rifle and carbine applications. Features include Auto On & Off, 10 Brightness Wettings, up to 50K Hours Battery Life, Absolute Co-witness Mount, Anti-reflection Device and Pop-up Lens Caps. The M3X Magnifier allows you to extend your shooting range to include more distant targets that are difficult to see with the normal 1X magnification of most red dot sights. The flip to side design quickly engages/disengages magnifier to lock in at your desired position. Allows for lower 1/3 or absolute co-witness mounting heights red dot sights with 2 included riser plates. Ideal for shooters who want to increase the effective range of their red dot sight.