Put more accuracy on top of your firearm without having to put more into it. The Holosun® HS503RMicro Reflex Sight employs new LED technology that squeezes up to 100,000 hours of life from a single battery. The MRS (Multiple Reticle System) gives you a choice of 2 MOA Dot or 65 MOA Circle with Dot, while the Adjustable Brightness Dial gives you faster operation and control of the light intensity. Multi-coated lens offer a parallax-free sight picture with unlimited eye relief. Durable 6061 aluminum construction is unaffected by extreme weather conditions and a 1/3 co-witness and low mount are both included.