The Holosun HS510C in Flat Dark Earth is a 1x open reflex red dot sight running the Multi-Reticle System behind a 0.91 x 1.26 in (23 x 32 mm) window, on an integrated quick-detach Picatinny mount.
The wide rimless window is what people buy this shape of sight for: both eyes stay open, the target is not framed by a tube, and a 65 MOA circle lands on a close target faster than any small dot will.
The reticle switches between a 2 MOA red dot, the 65 MOA circle, and both together as a circle-dot, from a 650 nm LED with 12 brightness settings, ten for daylight and two compatible with night vision, plus manual, automatic and Lockout modes. Adjustment is 0.5 MOA per click with 50 MOA of travel each way. Power is a side-loading CR2032 rated at up to 50,000 hours at setting 6, supported by Solar Failsafe and Shake Awake with an auto-off and memory function. A titanium hood shields the emitter over an aluminium body in a Flat Dark Earth MAO finish, rated IP67 and specified from -30 to 60 degrees C, at 3.30 x 1.68 x 1.78 in (84 x 43 x 45 mm) and 4.94 oz (140 g).
It is a natural fit on a practical shotgun or a straight-pull carbine, where the circle does the close work and the dot inside it takes the deliberate shot, and the FDE finish pairs with FDE furniture. The trade-off against an enclosed sight is inherent to the design: the emitter faces an open window, so heavy rain or mud on the lens can dim the reticle until you wipe it.
Why shooters choose the HS510C FDE
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Reticle — red Multi-Reticle System, a 2 MOA dot, a 65 MOA circle, or circle-dot
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Illumination — 12 settings, ten daylight and two night-vision, with manual, auto and Lockout modes
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Power — side-loading CR2032 to 50,000 hours at setting 6, with Solar Failsafe and Shake Awake
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Mount — integrated quick-detach Picatinny mount
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Build — aluminium with a titanium hood, Flat Dark Earth MAO finish, IP67
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Size — 3.30 x 1.68 x 1.78 in (84 x 43 x 45 mm), 4.94 oz (140 g)
What the HS510C FDE fits
The quick-detach mount clamps to any MIL-STD-1913 rail, which means an AR-pattern flat-top, a receiver rail on a rimfire or pistol-calibre carbine, or a rail section fitted to a shotgun. The same optic in black is the HS510C in black, the green-reticle FDE version is the HS510C green in FDE, and the HS510C and HM3X magnifier combo adds magnification behind it. See also red dot sights.
Specifications
| Type |
Open reflex red dot sight, 1x |
| Reticle |
Multi-Reticle System, 2 MOA red dot / 65 MOA circle / circle-dot |
| Light Source |
650 nm red LED |
| Window |
0.91 x 1.26 in (23 x 32 mm), multi-coated, parallax-free |
| Illumination |
12 settings (10 daylight / 2 night vision), manual, auto and Lockout |
| Adjustment |
0.5 MOA per click, 50 MOA travel each way |
| Battery |
CR2032 side-loading tray, up to 50,000 hours at setting 6 |
| Power Backup |
Solar Failsafe, Shake Awake, auto-off and memory |
| Mount |
Integrated quick-detach Picatinny |
| Housing |
Aluminium with titanium hood, Flat Dark Earth MAO finish |
| Water Resistance |
IP67 |
| Operating Temperature |
-30 to 60 degrees 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-FDE |
Circle for speed, dot for precision, and a lever to take it off the gun. Order the HS510C FDE 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, Holosun HS510C Black or browse all Holosun
