The Holosun HS510C is a 1x open reflex red dot sight with a 0.91 x 1.26 in (23 x 32 mm) window and an integrated quick-detach Picatinny mount, finished in black.
The Multi-Reticle System is why this one sells the way it does: a 65 MOA circle for speed, a 2 MOA dot for precision, or both at once, chosen with a button rather than a different optic.
The emitter is a 650 nm red LED under a titanium protective hood, in an aluminium housing with a black MAO finish rated IP67, tested to 5000G of vibration and specified from -30 °C to 60 °C. It measures 3.30 x 1.68 x 1.78 in (84 x 43 x 45 mm) and weighs 4.94 oz (140 g).
Twelve brightness settings split into 10 daylight and 2 night-vision levels, with manual and automatic modes and a lockout to stop the buttons being knocked. Turrets move 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 behind it. The integrated mount sets the dot at 1.41 in (35.8 mm). Being honest about the design: the emitter is open to the weather, and heavy rain across the lens will scatter the dot in a way an enclosed sight avoids.
Why shooters choose the HS510C
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Reticle — Multi-Reticle System — 2 MOA dot, 65 MOA circle or circle-dot
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Power — side-loading CR2032 with Solar Failsafe, up to 50,000 hours at setting 6
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Illumination — 10 daylight and 2 night-vision settings, manual, automatic or locked out
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Adjustment — 0.5 MOA per click, ±50 MOA windage and elevation
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Mount — integrated quick-detach Picatinny mount at 1.41 in (35.8 mm) dot height
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Housing — aluminium with a titanium hood, IP67 rated and tested to 5000G
What the HS510C fits
It needs a MIL-STD-1913 Picatinny rail, which covers AR-pattern flat-tops, pistol-calibre carbines, rimfires and any shotgun with a rail section on the receiver or rib. The same optic in Flat Dark Earth is the HS510C in FDE, and the version bundled with a magnifier is the HS510C and HM3X combo. Rails to mount it on are in Picatinny rail sections.
Specifications
| Type |
Open reflex red dot sight, 1x |
| Reticle |
Multi-Reticle System — 2 MOA dot / 65 MOA circle / circle-dot |
| Light Source |
650 nm red LED |
| Window Size |
0.91 x 1.26 in (23 x 32 mm) |
| Illumination |
10 daylight / 2 night vision settings, with lockout mode |
| Click Value |
0.5 MOA per click |
| Adjustment Range |
±50 MOA windage and elevation |
| Battery |
CR2032 side-loading tray, up to 50,000 hours at setting 6 |
| Power Backup |
Solar Failsafe, with Shake Awake |
| Mount |
Integrated quick-detach Picatinny, 1.41 in (35.8 mm) dot height |
| Housing |
Aluminium with titanium hood, black MAO finish, IP67, 5000G |
| Operating Temperature |
-30 °C to 60 °C |
| Dimensions |
3.30 x 1.68 x 1.78 in (84 x 43 x 45 mm) |
| Weight |
4.94 oz (140 g) |
| MPN |
HS510C-RD |
Three reticles, one optic, and a lever that puts it back on zero. 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: Red Dot Sights, HS515CM Red Dot or browse all Holosun
