The Holosun HS507C-X3 steps up from the 407C-X3 with the addition of Holosun's Multi-Reticle System, giving shooters the ability to run a 2 MOA dot for precision work, a 32 MOA circle for fast close-range acquisition, or both combined for a layered aiming reference. The flexibility to switch between configurations means the same optic works across carry, competition, and duty applications without compromise. Brightness management follows the same automatic-first approach as the rest of the X3 line. The forward-facing photodiode reads ambient light and adjusts reticle intensity continuously, with Solar Failsafe providing a battery backup through solar power in auto mode. Manual control with memory and lockout modes gives the shooter full command when automatic adjustment isn't preferred - the optic returns to the last-used brightness setting on activation and stays there until deliberately changed. At 1.55 oz. and built around the RMR footprint, the HS507C-X3 sits low on the slide and fits a wide range of carry and duty pistols without adapters. The 100,000-hour CR1632 runtime and Shake Awake keep the optic ready without demanding regular battery maintenance. 2 MOA Dot / 32 MOA Circle Multi-Reticle System Trijicon RMR footprint for broad pistol compatibility Forward-facing photodiode automatically adjusts brightness as light changes Solar Failsafe provides continuous power backup in natural or artificial light Shake Awake with memory mode and lockout for carry and duty use 8 daylight and 4 night vision brightness settings CR1632 battery with up to 100,000-hour runtime on setting six Hard-anodized 7075-T6 aluminum housing IP67 waterproof and 5000G vibration rated