The Holosun HS510C Green Dot Sight in Flat Dark Earth (HS510C-GR-FDE) is a 1x open reflex green dot sight with Holosun's Multi-Reticle System — a 2 MOA green dot, a 65 MOA circle, or both together as a circle-dot — behind a 0.91 × 1.26 in (23 × 32 mm) window, on an integrated quick-detach Picatinny mount. The housing is finished in Flat Dark Earth to match FDE furniture.
Solar Failsafe supplements the side-loading CR2032 with light, and Shake Awake puts the optic to sleep when it is still and wakes it on movement, for up to 50,000 hours of runtime. A titanium protective hood shields the emitter, and the aluminium housing is rated IP67 and tested to 5000G of vibration.
How It Compares
The same optic with a red reticle is the HS510C red dot sight in Flat Dark Earth, and in black it is the HS510C red dot sight in Black. For a green reticle in a black housing, see the HE510C green dot sight. Browse all green dot sights and shotgun red dot sights, or read our comparison of green and red reticles.
Ideal For
- Practical shotgun and 3-Gun, where the 65 MOA circle drives fast close-range hits
- Civilian Service Rifle and practical rifle on straight-pull AR-pattern carbines
- Pistol-calibre carbines and rimfire rifles running a Picatinny rail
- Night fox and vermin control, where a green reticle stays visible against dark ground
Key Features
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Reticle: Green Multi-Reticle System — selectable 2 MOA dot, 65 MOA circle, or circle-dot
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Electronics: Solar Failsafe supplemental power plus Shake Awake motion activation with memory function
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Illumination: 12 brightness settings — 10 daylight and 2 night-vision compatible — with manual, automatic and Lockout modes
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Emitter: 540 nm green LED, up to 50,000 hours of battery life
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Housing: aluminium with a titanium protective hood, Flat Dark Earth MAO finish, IP67 rated
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Mount: integrated quick-detach Picatinny mount at 1.41 in (35.8 mm) co-witness dot height
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Battery: side-loading CR2032 tray, changeable without removing the optic
Technical Specifications
| Optic Type |
Open reflex green dot sight, 1x (non-magnified) |
| Reticle |
Multi-Reticle System — 2 MOA green dot / 65 MOA circle / circle-dot |
| Reticle Colour |
Green |
| Light Source |
540 nm green LED |
| Window Size |
0.91 × 1.26 in (23 × 32 mm) |
| Lens Coating |
Multi-coated |
| Parallax |
Parallax-free |
| Eye Relief |
Unlimited (non-critical eye relief) |
| Illumination |
12 settings — 10 daylight / 2 night-vision compatible; manual and automatic modes; Lockout Mode |
| Click Value |
0.5 MOA per click |
| Adjustment Range |
±50 MOA windage and elevation |
| Battery |
CR2032 in a side-loading tray, up to 50,000 hours at brightness setting 6 |
| Solar Support |
Solar Failsafe supplemental power |
| Power Management |
Shake Awake motion activation, auto-off and memory function |
| Mount |
Integrated quick-detach Picatinny mount, 1.41 in (35.8 mm) co-witness dot height |
| Housing / Finish |
Aluminium with titanium protective hood, Flat Dark Earth (MAO) finish |
| Water Resistance |
IP67 water and dust resistant |
| Vibration Rating |
5000G |
| Operating Temperature |
-30 °C to 60 °C |
| Length |
3.30 × 1.68 × 1.78 in (84 × 43 × 45 mm) |
| Weight |
4.94 oz (140 g) |
| MPN / UPC |
HS510C-GR-FDE / 605930624953 |
What's Included
- Holosun HS510C-GR-FDE green dot sight with integrated QD Picatinny mount
- Lens cloth, multi-tool, user manual and warranty card
Warranty
Covered by Holosun's manufacturer warranty, handled in the UK by Xtreme Tactical.
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Holosun's warranty.
Frequently Asked Questions
What reticle options does the Holosun HS510C Green Dot Sight in Flat Dark Earth have?
The Holosun HS510C Green Dot Sight in Flat Dark Earth uses the Multi-Reticle System, which switches between a 2 MOA green dot on its own, a 65 MOA circle on its own, and both together as a circle-dot. The 65 MOA circle is the fast option for close shotgun and carbine work, and the 2 MOA dot is the precise one.
Is the Holosun HS510C-GR-FDE suitable for a shotgun?
Yes. The Holosun HS510C-GR-FDE has an integrated quick-detach Picatinny mount, an open window that keeps both eyes working, and a 65 MOA circle that suits fast target pick-up, which is why the HS510C family is a common choice for practical shotgun in the UK. It needs a Picatinny rail section on the receiver or rib.
How long does the battery last on the Holosun HS510C-GR-FDE?
The Holosun HS510C-GR-FDE runs up to 50,000 hours on a single CR2032 at brightness setting 6. Solar Failsafe adds supplemental power in daylight and will keep the sight running if the cell fails, and Shake Awake shuts the reticle off when the gun is still.
Will the Holosun HS510C-GR-FDE co-witness with AR-pattern iron sights?
Yes. The integrated quick-detach mount on the Holosun HS510C-GR-FDE sets the dot at 1.41 in (35.8 mm), Holosun's stated co-witness dot height, so AR-height iron sights line up in the window on a standard flat-top receiver.
Is the Holosun HS510C-GR-FDE night-vision compatible?
Yes. Two of the twelve brightness settings on the Holosun HS510C-GR-FDE are night-vision compatible, so the reticle can be dimmed far enough to use behind a night vision device.
Can I change the battery on the Holosun HS510C-GR-FDE without losing zero?
Yes. The Holosun HS510C-GR-FDE uses a side-loading CR2032 tray, so the cell can be replaced with the optic still mounted and zeroed.
