This Holosun kit pairs the HE510C-GR open reflex sight, running a green Multi-Reticle System behind a 0.91 x 1.26 in window, with the HM3X 3x flip-to-side magnifier.
A 65 MOA circle finds the target and a 2 MOA dot finishes it; putting 3x behind that pairing extends the same rifle to distances where the circle on its own is simply too coarse to use.
The reticle is green at 540 nm and switches between the dot, the circle and both together. Brightness covers 10 daylight and 2 night-vision settings in manual or automatic mode, and the turrets move 0.5 MOA per click across ±50 MOA. Power is a side-loading CR2032 rated up to 50,000 hours, with Solar Failsafe as backup and Shake Awake to shut the reticle down when the rifle is still.
The sight weighs 4.94 oz, measures 3.3 x 1.68 x 1.78 in, and its aluminium housing carries a titanium hood over the emitter with an IP67 rating. It fits a Picatinny rail on a quick-detach mount, and the HM3X flips aside for a clean 1x picture. Two things to be straight about: this is an open reflex, so the emitter faces the weather in a way an enclosed sight does not, and Holosun does not publish a mount height for this kit, so check the co-witness against your own irons rather than assuming it.
Why shooters choose the HE510C-GR combo
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Sight — HE510C-GR open reflex with a 0.91 x 1.26 in window
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Reticle — Multi-Reticle System — 2 MOA green dot and 65 MOA circle, selectable
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Magnifier — HM3X 3x on a flip-to-side mount
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Power — side-loading CR2032 with Solar Failsafe, up to 50,000 hours
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Illumination — 10 daylight and 2 night-vision settings, manual or automatic
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Housing — aluminium with a titanium hood, IP67 rated, 4.94 oz
What the HE510C-GR combo fits
Both parts clamp to a MIL-STD-1913 Picatinny rail, so an AR-pattern flat-top with enough rail length for sight and magnifier is the natural host. The sight on its own is the HE510C green dot sight, and for a titanium-bodied version of the same idea see the HE512T in green. More of the range sits in green dot sights.
Specifications
| Kit Contents |
HE510C-GR open reflex sight and HM3X 3x magnifier |
| Reticle |
Multi-Reticle System — 2 MOA dot and 65 MOA circle, selectable |
| Reticle Colour |
Green, 540 nm |
| Window |
0.91 x 1.26 in |
| Illumination |
10 daylight / 2 night vision settings, manual and automatic |
| Click Value |
0.5 MOA per click |
| Adjustment Range |
±50 MOA windage and elevation |
| Battery |
CR2032 side-loading tray, up to 50,000 hours |
| Power Backup |
Solar Failsafe, with Shake Awake |
| Mount |
Quick-detach Picatinny |
| Magnifier |
HM3X 3x on a flip-to-side mount |
| Housing |
Aluminium with a titanium hood, IP67 |
| Weight |
4.94 oz (sight) |
| Dimensions |
3.3 x 1.68 x 1.78 in (sight) |
| MPN |
HE510C-GR+M3X |
Two optics chosen to work together rather than two bought separately and hoped over. Order the HE510C-GR combo 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 Magnifiers, HE509T X2 Green or browse all Holosun
