Below are the Holosun 503 Series of rifle optics. These are offered at the best price with free shipping.

The 503 Series of Holosun red & green dot sights is their entry level series with the MRS reticle - Multi Reticle System. These are 20mm tube red and green dot optics.

These value driven rifle optics have 50k hours of battery life, aluminum housings, high and low mounts, side removable batteries, are available in red or green reticles and have versions with solar panels, shake awake, and manual/auto brightness modes.

All Holosun 503 series optics have Holosuns MRS reticle which is a 65 MOA ring and 2 MOA dot. The reticle can be toggled by holding down the "-" button for three seconds. You can use just the 2 MOA dot, just the 65 MOA circle, or both together.