The Holosun ARO RD2 delivers a crisp 2 MOA red dot and rugged performance in a compact form factor. Built for rapid acquisition and long-lasting reliability, it features Shake Awake tech and comes with two mount heights for versatile rifle setups. Whether you're training, competing, or on duty, this optic is mission-ready. 2 MOA red dot for fast target acquisition Shake Awake auto-activation with motion detection Up to 50,000-hour battery life 22mm housing with wide sight picture Multilayer reflective glass for clarity Includes 1.63" and 1.05" mount options CR2032 battery included Compact and lightweight rifle optic