The Holosun ARO-CORE-MRS is a compact enclosed rifle sight featuring a 22 mm optical window and selectable Multi-Reticle System with a 2 MOA dot, 65 MOA circle, or combined circle-dot reticle. It uses a side-loading CR2032 battery with up to 50,000 hours of battery life and includes Shake Awake, Memory, manual brightness controls, and 10 daylight and 2 night-vision compatible brightness settings. The sight features an aluminum housing with MAO finish, 0.5 MOA adjustment, and included 1.63" and 1.05" mounts.