ade advanced optics mini rd3-006x green dot reflex sight for ruger sr22 pistol mounting plate that replace rear sight ade advanced optics ade advanced optics first made its appearance in the firearms accessory industry by doing private label production for several major manufacturers and retailers. during this period, ade advanced optics began receiving requests from numerous customers for access to the affordable, high quality products that ade advanced optics was capable of producing. by soliciting feedback from both clients and end users, ade advanced optics was able to overcome the challenges a new company often faces when entering a global market and industry, especially one as competitive as the shooting, hunting, and outdoors industry. features: large field of view holographic reflex new design for use in bright daylight 5 levels green dot; on/off switch parallax corrected built-in 21mm weaver mount unlimited eye relief long battery life up to three months on all the time. specifications: model: rd3-006b field of view: 19 yards at 100 yards weight(net): 2 oz length: 48mm (1.9 inches) width: 25mm 3 moa dot magnification: 1.0 x sight window: 22mmx25mm