The Holosun 407C-X3 is an open reflex pistol sight built around the RMR footprint with a simple 2 MOA dot reticle. Solar Failsafe and a forward-facing photodiode help manage brightness as lighting conditions change, while Shake Awake activates the optic with movement and helps conserve battery power during inactivity. The side-loading CR1632 battery allows replacement without removing the optic, while the 7075-T6 aluminum housing provides durability for carry, duty, and range applications.