Holosun HS510C Green Dot Sight Multi-Reticle System Solar Failsafe FDE
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The Holosun HS510C in Flat Dark Earth is a 1x open reflex sight with a green Multi-Reticle System — a 2 MOA dot, a 65 MOA circle or both — behind a 0.91 × 1.26 in window, on an integrated quick-detach Picatinny mount.
The rimless window is the reason this sight sells: there is no tube edge to look past, so the shooter keeps both eyes open and the 65 MOA circle drops onto a close target almost without conscious aiming.
A titanium hood shields the emitter over an aluminium body finished in Flat Dark Earth by MAO, rated IP67, tested to 1000G and usable from −30 °C to 60 °C. It measures 3.30 × 1.68 × 1.78 in and weighs 4.94 oz. The 540 nm green LED runs 12 brightness settings — 10 daylight and 2 for night vision — in manual or automatic mode with a lockout, adjusting 0.5 MOA per click across ±50 MOA, and the side-loading CR2032 gives up to 50,000 hours at setting 6 with Solar Failsafe and Shake Awake behind it.
Practical shotgun, 3-Gun and carbine shooters buy it for the circle and the quick-detach mount; the green reticle holds up well against dark ground at dusk. Be clear that the emitter is open rather than enclosed, so heavy rain or mud on the front glass will affect the reticle in a way a sealed sight would not, and it needs a Picatinny rail section rather than a bare receiver.
The integrated mount clamps to any Picatinny rail, which on a shotgun means a rail section on the receiver or rib. The same sight with a red reticle in the same finish is the HS510C red in FDE, in black it is the HS510C red, and the magnifier pairing is the HS510C and HM3X combo.
| Type | Open reflex sight, 1x |
|---|---|
| Reticle | Multi-Reticle System — 2 MOA green dot / 65 MOA circle / circle-dot |
| Light Source | 540 nm green LED |
| Window | 0.91 × 1.26 in (23 × 32 mm) |
| Illumination | 12 settings — 10 daylight / 2 night vision, manual and automatic |
| Adjustment | 0.5 MOA per click, ±50 MOA |
| Battery | CR2032 side-loading, up to 50,000 hours at setting 6, Solar Failsafe |
| Mount | Integrated quick-detach Picatinny |
| Housing | Aluminium with titanium hood, MAO Flat Dark Earth, IP67, 1000G |
| Operating Range | −30 °C to 60 °C |
| Dimensions | 3.30 × 1.68 × 1.78 in |
| Weight | 4.94 oz (140 g) |
| MPN | HS510C-GR-FDE |
A wide green window on a lever mount, in a finish that matches the furniture. Order the HS510C today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: Green Dot Sights, HS515CM or browse all Holosun.
| Brand | Holosun |
|---|---|
| Part no. | HS510C-GR-FDE |
| Category | Red Dot Sight |
| Barcode | 605930624953 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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