Holosun 507C X3 Red Circle Dot HS507C-X3-RD – Overview –
The Holosun HS507C-X3-RD-MRS updates the proven 507C platform with a reinforced housing, advanced brightness control, and Holosun’s Multi-Reticle System in a compact optic built for modern pistols. Designed around the RMR footprint, it delivers a low-profile solution that works just as well for everyday carry as it does for duty and range use. A forward-facing photodiode pairs with Solar Failsafe to automatically manage brightness as light changes, while manual controls with memory and lockout give shooters full authority when needed. Powered by a side-loading CR1632 battery rated up to 100,000 hours and backed by Shake Awake, IP67 waterproofing, and 5000G vibration resistance, the HS507C-X3-RD-MRS blends versatility, durability, and smart power management into one no-nonsense pistol optic.
– TECH & FEATURES –
Solar Failsafe™
Shake Awake™
Multiple Reticle System
Multilayer Reflective Glass
Solar Failsafe™
Solar Failsafe Technology is one of many innovations featured on solar-equipped Holosun optics. With Solar Failsafe, if your battery fails you always have a backup power source when natural or artificial light is available. Solar Failsafe is activated while in Auto Mode where reticle intensity is automatically adjusted based on the amount of light the solar cell receives. In brighter conditions you have a brighter reticle and in lower-light conditions the reticle will step down in intensity to match any lighting conditions. On models equipped with a super capacitor, it is possible to run the optic, indefinitely, in daytime and night conditions, by maintaining a charge through the Solar Failsafe System all without a battery.
– Specification – Holosun 507C X3 Red Circle Dot HS507C-X3-RD

- Multi-Reticle System with 2 MOA dot and 32 MOA circle
- RMR footprint compatibility
- Automatic brightness with Solar Failsafe
- Shake Awake with memory and lockout
- Side-tray CR1632 battery
- 7075-T6 aluminum housing
- IP67 waterproof
- 5000G vibration rated
OPTICAL SPECS
| Reticle | 2 MOA Dot & 32 MOA Circle |
| Light Wavelength | 650nm |
| Reticle Color | Red |
| Parallax Free | Yes |
| Unlimited Eye Relief | Yes |
| Magnification | 1x |
| Multi-Coatings | Yes |
ELECTRONIC SPECS
| Power Source | Solar & Battery |
| Battery Type | CR1632 |
| Battery Life (Hours) | 100000 |
| Thermal Modes | N/A |
| Digital Modes | N/A |
| Video Recording | N/A |
| Screen Refresh Rate | N/A |
| Digital Screen | N/A |
| Brightness Setting | 8 DL & 4 NV |
PHYSICAL SPECS
| Window Size (in) | 0.91×0.67 |
| Dimension (in) | 1.78×1.31×1.1 |
| Weight (oz) | 1.55 |
MECHANICAL SPECS
| Housing Material | 7075 T6 Aluminum |
| Surface Finish | Hard Anodize |
| Adjustment per Click | 1 MOA |
| W&E Travel Range | ±50 MOA |
ENVIRONMENT SPECS
| Storage Temperature | -40℃~70℃ |
| Working Temperature | -30℃~60℃ |
| Submersion | IP67 |
| Vibration | 10000G |
The Holosun 507C X3 Red Circle Dot HS507C-X3-RD is a premium open-reflex pistol optic designed for shooters who demand speed, reliability, and advanced technology in a rugged red dot sight. Built for defensive carry, duty use, and competition shooting, this optic delivers fast target acquisition and exceptional accuracy while maintaining the durability Holosun is known for.
At the core of the Holosun 507C X3 Red Circle Dot HS507C-X3-RD is Holosun’s versatile Multi-Reticle System (MRS). This system allows shooters to switch between a precise 2 MOA red dot, a 32 MOA circle, or a circle-dot combination, giving users the flexibility to adapt their aiming reticle based on shooting style and scenario. The large circle is ideal for rapid target acquisition in close-range engagements, while the 2 MOA dot offers precise aiming capability for more accurate shots at distance.
The optic features Solar Failsafe™ technology, which provides a secondary power source when ambient light is available. In Auto Mode, the reticle brightness automatically adjusts to match lighting conditions using the solar panel, ensuring optimal visibility throughout the day. Combined with Holosun’s highly efficient LED system, the HS507C-X3-RD can achieve up to 50,000 hours of battery life, minimizing the need for frequent battery replacements.
Constructed from durable 7075-T6 aluminum, the housing is designed to withstand recoil, impacts, and demanding environments. The optic also features Shake Awake™ technology, which automatically activates the reticle when motion is detected and powers down during inactivity to preserve battery life. This ensures the optic is always ready when needed without unnecessary power drain.
Precision multi-coated glass provides a clear, distortion-free sight picture while reducing glare and improving light transmission. The side-loading battery tray allows for easy battery replacement without removing the optic from the firearm, helping maintain zero and simplifying maintenance.
Compatible with the RMR footprint, the Holosun 507C X3 Red Circle Dot HS507C-X3-RD fits a wide range of optic-ready pistols and mounting plates. Whether used for concealed carry, home defense, or competition shooting, this optic delivers the speed, versatility, and durability serious shooters expect from a modern red dot sight.







aukzcord (verified owner) –
I love the new design over the previous. The shape is better and adds better impact resistance making it more durable. I LOVE the auto brightness refinement. Adding the front facing sensor to work in tandem with the top solar panel was a huge W for Holosun. I put some rounds through it after mounting and it held zero just fine. Solid product. Arax Systems has become my exclusive shop for sights
Jeremy Oppenheim (verified owner) –
Loved the x2 and the x3 is a definite upgrade! Has a sleeker look and the auto brightness works a lot better. Definitely recommend!
Arsham Boduryan (verified owner) –
Good window size, easy to find dot, and the auto dimming feature works good. The blacked out housing on the X3 version is a huge plus, giving it a cleaner look. Very happy with it so far.