Free Shipping

on most orders over $99


100% Guarantee

With 30 day returns

Holosun HS510C Open Reflex Red Circle/Dot & HM3X Magnifier - Flat Dark Earth - Bundle Email For Coupon Code

Adding to cart… The item has been added


Introducing the HM3X-FDE: a premium 3X magnifier crafted from durable aluminum, engineered to perfectly complement your red dot sight. With its quick release, ambidextrous, flip-to-side Picatinny rail mount, this magnifier offers unparalleled convenience and versatility. Holosun goes the extra mile by providing a spacer for absolute and lower 1/3 co-witness dot heights, ensuring compatibility with a wide range of optics. Boasting a generous 2.75" eye relief and IP67 certification for water resistance, the HM3X-FDE is built to withstand tough conditions. Fine-tune your aiming with windage and elevation adjustments, guaranteeing precise zeroing to your optic's settings. Plus, enjoy the added convenience of a built-in flat driver tool for effortless adjustments. Elevate your shooting experience with the HM3X-FDE.


  • Item Package Dimensions L x W x H 7.4 x 5.39 x 3.7 inches
  • Item Dimensions LxWxH 1.53 x 3.94 x 2.44 inches
  • Item Weight 10.72 ounces
  • Brand Name HOLOSUN
  • Warranty Description SEE MANUFACTURER
  • Model Name HM3X-FDE
  • Color FDE
  • Material Aluminum
  • Suggested Users unisex-adult
  • Number of Items 1
  • Manufacturer Holosun Technologies, Inc
  • Part Number HM3X
  • Included Components Riser Mount, HM3X-FDE


  • Color: Flat Dark Earth
  • Finish: Matte
  • Magnification: 1 x
  • Objective Window Size: .91x.1.2 in
  • Reticle: 65 MOA Circle, Dual, 2 MOA Dot
  • Illumination Type: LED
  • Brightness Settings: 12
  • Eye Relief: Unlimited
  • Adjustment Type: MOA
  • Adjustment Click Value: 0.5 MOA
  • Parallax: Parallax Free
  • Optical Coating: Multi-Coated
  • Attachment/Mount Type: QD Mount
  • Battery Type: CR2032
  • Battery Life: 20,000 - 50,000 hours
  • Operating Temperature: -22 - 140 Fahrenheit
  • Water Resistance Level: IP67
  • Length: 3.3 in
  • Width: 1.6 in
  • Height: 1.8 in
  • Weight: 8.3 oz
  • Included Accessories: None
  • Magnification Type: Fixed
  • W/E Travel at 100 Yds: +/-50 MOA

Designed for rifles, shotguns, and other long gun applications, this HE510C Reflex Sight in a flat dark earth housing from Holosun features a red circle-dot reticle and a multicoated lens for clear and unobstructed targeting at close and long ranges. Built with an aluminum housing and a grade 5 titanium hood, the sight comes with a QD absolute co-witness mount with a 1.4" dot height for added compatibility. The multiple reticle system has three options: a 2 MOA dot, a 65 MOA circle, and a combined reticle. The sight's red Super LED is powered by a CR2032 battery, providing 12 brightness levels including two night-vision settings, and delivering 50,000 hours of battery life. The battery is backed up by Holosun's Solar Failsafe technology, which uses solar power to keep the sight working after the battery fails.

Optical Performance

  • Unlimited eye relief when using both-eyes-open shooting techniques allows for complete situational awareness
  • Multiple layers of antireflective coating on all optics ensure bright and clear views through the sight window

Reticle Details

  • 65 MOA aiming circle for distance shooting
  • 2 MOA aiming dot for closer range targets
  • 1.63" dot height with included lower 1/3 co-witness mount
  • 12 brightness settings, including two suitable for night vision gear
  • Solar FailSafe technology prevents reticle failure with battery back-up
  • Shake Awake technology with last setting recall

Use and Handling

  • 1 MOA adjustment per click impact point correction
  • +/- 30 MOA windage and elevation adjustments
  • Lock Mode prevents settings from unwanted adjustment

Construction Details

  • Durable aluminum housing with a titanium hood for added shock resistance
  • IP67-rated shock, fog, and waterproof
  • Included absolute co-witness QD mount
  • Runs up 50,000 hours on one included CR1632 battery

Related Products