Trijicon's technologically advanced Trijicon 1x42 Reflex Gun Sight with TA51 Flattop Mount offer shooters the perfect combination of speed and precision under virtually any lighting conditions. The Trijicon advantage includes- A bright aiming point in low light, no or bright light. Quick target acquisition and pinpoint accuracy. Big sight picture and realistic color. Built to be tough. Designed for both-eyes-open shooting.