1x Open Reflex Red Dot Sight with Multi-Side Picatinny Rails. This lightweight  tubeless reflex sight is CNC machined from durable T6 6061 aluminum, built to fit standard 20mm mounting rails. It features a large 22mm objective lens with unlimited eye relief, delivering a wide field of view for fast tracking moving targets. Switch between 4 distinct reticle patterns via the side selector knob, with smooth stepless red and green brightness adjustment to match all light conditions. Three integrated top & side Picatinny rails allow you to attach extra optics, lasers or other tactical accessories. Independent windage and elevation turrets deliver precise zeroing, compact and portable for all outdoor shooting, training and hunting use.