The Holosun HS510C FDE is the wide-window open reflex sight in a Flat Dark Earth finish — the same fast, rugged red dot sight built for AR-15s, carbines, PCCs and shotguns, dressed to match FDE furniture. Its large open window and Multi-Reticle System (a 2 MOA dot, a 65 MOA circle, or both combined) make it equally at home driving fast up close or holding a precise point further out.
Solar Failsafe supplements the side-loading CR2032 with light, and Shake Awake sleeps the optic when idle — together pushing battery life beyond what most shooters will ever cycle through. A titanium protective hood shields the emitter, and the integrated quick-detach Picatinny mount sets the dot at a 1.41" co-witness height. In stock for fast UK dispatch.
Related options
Prefer the classic black finish? See the HS510C in black. Want a green reticle in FDE? The HS510C FDE green uses the same housing with a high-visibility green dot.
IDEAL FOR
- AR-15 rifles and carbines
- PCC platforms
- Shotguns
- Home-defence and practical rifle builds
- Range training and dynamic shooting
- Shooters wanting a red circle-dot reticle with a Flat Dark Earth finish
KEY FEATURES
- Red Multi-Reticle System with selectable 2 MOA dot, 65 MOA circle, or circle-dot reticle
- Solar Failsafe for supplemental power and automatic brightness management
- Shake Awake motion activation with memory function
- Large open reflex window for faster target acquisition
- Flat Dark Earth housing finish
- Aluminium housing with titanium protective hood
- Integrated quick-detach Picatinny rail mount
- Side-loading CR2032 battery tray
- Manual brightness, automatic brightness, and Lockout Mode
- 10 daylight and 2 night-vision-compatible brightness settings
- IP67 waterproof construction
TECHNICAL SPECIFICATIONS
| MPN |
HS510C-FDE |
| UPC |
605930624991 |
| Optic Type |
Open Reflex Red Dot Sight |
| Reticle System |
Multi-Reticle System (MRS) |
| Reticle Options |
2 MOA Dot, 65 MOA Circle, Circle-Dot |
| Reticle Colour |
Red |
| Light Source |
LED |
| Wavelength |
650nm |
| Magnification |
1× |
| Window Size |
0.91" × 1.26" |
| Lens Coating |
Multi-Coated |
| Parallax |
Parallax-Free |
| Eye Relief |
Unlimited |
| Housing Material |
Aluminium with Titanium Protective Hood |
| Finish |
Flat Dark Earth (MAO) |
| Battery Type |
CR2032 |
| Battery Location |
Side-Loading Tray |
| Battery Life |
Up to 50,000 Hours at Brightness Setting 6 |
| Solar Support |
Solar Failsafe |
| Brightness Settings |
12 Total: 10 Daylight / 2 Night Vision |
| Brightness Modes |
Manual and Automatic |
| Shake Awake |
Yes |
| Auto-Off |
Yes |
| Memory Function |
Yes |
| Lockout Mode |
Yes |
| Adjustment Value |
0.5 MOA per Click |
| Windage & Elevation Travel |
±50 MOA |
| Mount Type |
Integrated Quick-Detach Picatinny Mount |
| Dot Height |
1.41" Co-Witness |
| Waterproof Rating |
IP67 |
| Vibration Rating |
5000G |
| Operating Temperature |
-30°C to 60°C |
| Dimensions |
3.30" × 1.68" × 1.78" |
| Weight |
4.94 oz |
WHAT'S INCLUDED
- Holosun HS510C-FDE Red Dot Sight with integrated QD Picatinny mount
- CR2032 battery
- T10 L-key / multi-tool
- Lens cloth
- User manual
- Warranty card
UK Delivery & Support
This Holosun HS510C FDE is UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based aftersales support and Holosun's warranty.
Frequently Asked Questions
What reticle options does it have?
A red Multi-Reticle System: a precise 2 MOA dot, a fast 65 MOA circle, or both combined as a circle-dot — switchable on the optic.
How long does the battery last?
Up to 50,000 hours on a CR2032, with Solar Failsafe and Shake Awake extending that further by supplementing power and sleeping the optic when idle.
Will it co-witness on an AR-15?
Yes — the integrated QD mount sets the dot at a 1.41" co-witness height on a standard flat-top.
Is it night-vision compatible?
Yes — two of its twelve brightness settings are night-vision compatible.
What other finishes are available?
This is the Flat Dark Earth (red reticle) version; it is also offered in black, and in FDE with a green reticle.
