4 Best Holosun 510c of 2026 For Crisp Reticles and Magnifier Combos

1

HOLOSUN 510C Multi-Reticle 2 MOA Dot & 65 MOA Circle

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• ARS Mark

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  9.6
• Brand
  HOLOSUN

Key specs2

Housing Finish

Flat Dark Earth (FDE)

Illumination System

• 12 brightness settings for varied ambient lighting
• Solar FailSafe ambient light power backup
• Shake-Awake motion sensor activation

Pros & cons53

Pros

• Green reticle offers crisp contrast against bright outdoor backdrops
• Dual reticle options include a precise 2 MOA dot and a wide 65 MOA circle
• Solar FailSafe provides backup power when ambient light is available
• Shake-Awake technology activates the reticle instantly upon detecting movement
• Flat dark earth housing matches earth-toned rifle finishes and furniture

Cons

• Standalone optic package excludes the HM3X magnifier for distant targets
• Open reflex housing leaves the emitter exposed to rain and debris
• Earth-tone finish will not match standard black firearm builds

2

HOLOSUN HE510C-GR Multi-Reticle Green 2 MOA Dot & 65 MOA

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• ARS Mark

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  8.6
• Brand
  HOLOSUN

Key specs2

Weather Resistance

Waterproof build

Target Acquisition

The open reflex window pairs with a 2 MOA dot and 65 MOA ring, allowing rapid target transitions on long guns without blocking your peripheral field of view.

Pros & cons53

Pros

• Green reticle delivers high visibility and sharp edges for astigmatism sufferers
• Waterproof construction shields internal electronics in wet environments
• Selectable 2 MOA dot and 65 MOA ring support both precision and speed
• Solar FailSafe feature keeps the reticle illuminated in daytime light
• Shake-Awake system preserves battery runtime by sleeping during inactivity

Cons

• Comes without a magnifier, limiting target engagement strictly to 1x viewing
• Open reflex lens well can catch water droplets or mud during outdoor use
• Long gun mounting requires sufficient flat Picatinny rail clearance

3

HOLOSUN 510C & HM3X Combo RED/Green Multi-Reticle Circle Dot Open

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• ARS Mark

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  8.3
• Brand
  HOLOSUN

Key specs2

Optical Configuration

1x Open Reflex plus 3X Flip-to-Side Magnifier

Magnifier Integration

The bundled HM3X magnifier mounts directly behind the green circle-dot reflex sight, letting you flip between true 1x close-quarters speed and 3x reach without losing zero.

Pros & cons53

Pros

• Bundled HM3X magnifier flips into place instantly for 3x identification
• Green circle-dot reticle stays sharp across high-glare backdrops
• Multi-reticle system toggles between a 2 MOA center dot and outer circle
• Flip-to-side mount lets shooters switch quickly between close and mid-range views
• Complete factory bundle guarantees height alignment between optic and magnifier

Cons

• Combined optic and magnifier setup occupies substantial top rail length
• Added weight of the magnifier assembly increases overall rifle heft
• Open reflex emitter remains exposed to dust and precipitation

4

HOLOSUN HS510c Reflex Red Dot Sight + HM3X 3X Magnifier

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  8.0
• Brand
  HOLOSUN

Key specs2

Reticle Illumination

Red Dot Reticle

Magnification Versatility

• 3X optical reach for positive target identification
• Flip-to-side mount clears optic window instantly
• Factory alignment matches HS510c optical axis

Pros & cons53

Pros

• Factory-paired HM3X 3X magnifier provides immediate reach for mid-range targets
• Classic red reticle offers familiar visibility in dim indoor conditions
• Flip-to-side magnifier mechanism moves out of the eyeline for 1x shooting
• Bundling the optic and magnifier together avoids sourcing separate mounts
• Large open reflex lens window supports natural two-eyes-open shooting

Cons

• Red reticle can blur or flare for shooters with severe astigmatism
• Mounting both units leaves minimal rail space for backup iron sights
• Open reflex design allows dust or rain to collect on the exposed LED lens

Last update on 2026-10-05 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Should I buy the standalone 510C open reflex sight or the HM3X magnifier combo?

It depends on your shooting distance requirements and available rail space. If your setup is meant strictly for close-range target acquisition, the standalone 510C open reflex sight keeps your long gun balanced and lightweight. If you plan to engage targets at longer distances, buying the factory combo with the HM3X 3x flip-to-side magnifier avoids the hassle of buying a separate magnifier later. Check your rifle receiver length first to ensure you have enough rail room for both the optic and the magnifier mount behind it.

Is the green reticle HE510C-GR better than the red dot model?

The green reticle HE510C-GR provides higher contrast against bright daylight and outdoor foliage, and many shooters find green easier to distinguish without visual distortion. The red reticle version remains a dependable choice for neutral indoor backgrounds and low-light conditions across the 12 illumination settings. Both versions feature the exact same 2 MOA dot and 65 MOA circle pattern, so your choice should be based on your lighting conditions and visual comfort.

What reticle options come on the Holosun 510C multi-reticle system?

The Holosun 510C multi-reticle system gives you three switchable reticle configurations using a 2 MOA dot and a 65 MOA circle. You can select the precise 2 MOA dot alone for pinpoint aim, use the 65 MOA circle on its own for wide framing, or combine both into a circle-dot reticle. The sight includes 12 settings so you can match reticle brightness to indoor ranges or direct sunlight.

Will the 510C align properly with backup iron sights?

The 510C open reflex sight is built for long guns and mounts directly onto receiver rails, but the exact visual alignment depends on your iron sight height. Reviewing iron sights for cowitness with red dot sights can help you confirm whether your front and rear posts sit cleanly in the lower portion of the optic window. If you choose the 510C and HM3X combo, verify that your folding rear iron sight fits behind or underneath the flip-to-side mount without blocking the glass.

How do Shake-Awake and Solar FailSafe function on the 510C?

Shake-Awake activates the 2 MOA dot and 65 MOA circle reticle instantly whenever it detects motion, then shuts the illumination off during periods of rest to save power. Solar FailSafe uses onboard solar cells to draw ambient daylight, keeping your reticle powered even if your primary battery runs down. This dual-power layout ensures your sight is illuminated and ready whenever you shoulder your firearm.

Is the Holosun 510C waterproof, and is it available in FDE?

Yes, the HE510C-GR is listed as a waterproof sight designed for long guns, providing protection against wet field environments. Holosun also offers the 510C open reflex sight in an FDE finish alongside the standard black housing. Verify the specific product model code before buying to ensure you receive the exact finish and water resistance rating your platform requires.