Out Of Stock Holosun HM3X-FDE 3x Mangifier/Flip & QD mount – FDE
The Holosun HM3X-FDE is a solid, no-fuss 3x magnifier that lets you instantly stretch your red dot setup without overcomplicating things. Flip it in for extra reach, flip it out when you want speed—it’s that simple. The glass is clear, the eye relief is comfortable, and the QD mount means you can take it on or off in seconds. The Flat Dark Earth finish just tops it off if you’re matching a build. It’s basically one of those upgrades that quietly makes your setup way more versatile without adding hassle.
-Nathan (Technical Advisor)
The Holosun HM3X-FDE is a rugged 3× magnifier engineered to enhance the performance of your red dot sight by providing increased target identification and extended engagement capability. Housed in durable aluminium with an MAO surface finish and styled in Flat Dark Earth, it delivers a premium balance of clarity, reliability, and ease of use.
Designed for versatility, the HM3X features an ambidextrous flip-to-side Picatinny mount with a quick-release mechanism, allowing rapid transitions between magnified and unmagnified views. Holosun includes a spacer to ensure compatibility with both absolute and lower-1/3 co-witness heights, making it suitable for a wide range of red dot systems. With a generous 2.75" eye relief, 3× optical magnification, and IP67 environmental sealing, the HM3X-FDE is built to perform in demanding conditions. Windage and elevation adjustments enable precise alignment with your optic, while a built-in flat driver tool ensures easy on-the-go tweaks.
A simple, battery-free design guarantees consistent operation, making the HM3X-FDE an excellent choice for shooters seeking dependable magnification in a tough, mission-ready package.
- Power Source N/A
- Battery Type N/A
- Battery Life N/A
- Window Size N/A
- Dimensions 3.9 × 1.7 × 2.5 in
- Weight 9.8 oz
- Housing Material Durable Aluminium
- Surface Finish MAO
- Adjustment per Click N/A
- W&E Travel Range N/A
- Storage Temperature -21°C to 60°C
- Working Temperature -21°C to 60°C
- Submersion Rating IP67
- Vibration Resistance 1000G
- Transmittance 75%
- Field of View 7°
- Eye Relief 70 mm
- Exit Pupil 7.6 mm
- Magnification 3×
- Digital Zoom N/A
- Diopter N/A
- Durable Aluminium Housing: Strong, lightweight construction with MAO finish for long-term resistance to wear and environmental exposure.
- Flip-to-Side Mechanism: Instantly transition between magnified and unmagnified views with an ambidextrous flip design suited to both left- and right-handed shooters.
- Quick-Detach Picatinny Mount: Secure QD attachment allows fast installation and removal without tools.
- Height Compatibility Spacer: Included spacer supports absolute and lower-1/3 co-witness setups for maximum red dot compatibility.
- Bright, Clear Optics: Offers excellent clarity, 75% transmittance, and a comfortable exit pupil for enhanced visual performance.
- Precision Alignment: Integrated windage and elevation adjustments allow the magnifier to be perfectly aligned with your red dot’s point of aim.
- Generous Eye Relief: 70 mm of eye relief ensures comfortable and consistent positioning, even during dynamic shooting.
- No Battery Required: Fully optical system with no electronics, ensuring fail-proof reliability.
- IP67 Water Resistance: Ready for harsh field conditions, including rain, dust, and brief submersion.
- Built-In Adjustment Tool: Flat driver tool integrated into the design for convenient, tool-free adjustments.
- Holosun HM3X-FDE 3x Mangifier/Flip & QD mount – FDE
1. What does the HM3X-FDE do?
It’s a 3× magnifier designed to sit behind a red dot sight and extend your effective range and target clarity.
2. How does the flip-to-side mount work?
It swings out of the way when you don’t need magnification and locks back in place when you do—no need to remove it.
3. Is it quick detach?
Yes, it comes with a QD (quick detach) Picatinny mount for fast installation and removal.
4. What magnification does it provide?
A fixed 3x magnification, ideal for mid-range shooting and better target identification.
5. Is it compatible with different optic heights?
Yes, it includes a spacer so it works with both absolute and lower 1/3 co-witness setups.
6. How is the eye relief?
It offers around 2.75 inches (70mm) of eye relief, which is considered comfortable for a magnifier.
7. Can you adjust the focus?
Yes, it has a ±3 diopter adjustment so you can fine-tune the image to your eyesight.
8. Is it durable?
Very—it's built from aluminum with an IP67 rating, meaning it’s water-resistant and built for rough use.
9. What’s special about the FDE version?
Functionally the same as the standard model, just finished in Flat Dark Earth to match tan/FDE builds.
10. What’s the main advantage of this magnifier?
It gives you instant flexibility—run fast at 1x, then flip to 3x for distance—without changing optics or losing zero.
- HOLOSUN Limited Lifetime Warranty
Delivery costs & estimated arrival
Find your country below for the delivery charge and how long your order should take to reach you. All orders ship with FedEx. Estimates are in working days and exclude weekends and public holidays.
| Country | Up to 2kg | 2kg – 30kg | Estimated delivery | ||
|---|---|---|---|---|---|
| Order under €350 | Order €350 & over | Order under €350 | Order €350 & over | ||
| Austria | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
| Belgium | €8.95 | €14.95 | €14.95 | €14.95 | 4-6 working days |
| Bulgaria | €11.95 | €31.95 | €31.95 | €31.95 | 7-9 working days |
| Croatia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Cyprus | €14.95 | €89.95 | €89.95 | €89.95 | Contact us |
| Czechia | €10.95 | €21.95 | €21.95 | €21.95 | 5-7 working days |
| Denmark | €10.95 | €21.95 | €21.95 | €21.95 | 4-6 working days |
| Estonia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Finland | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
| France | €10.95 | €21.95 | €21.95 | €21.95 | 4-6 working days |
| Germany | €8.95 | €14.95 | €14.95 | €14.95 | 5-7 working days |
| Greece | €11.95 | €31.95 | €31.95 | €31.95 | 8-10 working days |
| Hungary | €11.95 | €31.95 | €31.95 | €31.95 | 5-7 working days |
| Ireland | €6.95 | €6.95 | €8.95 | €8.95 | 2-4 working days |
| Italy | €10.95 | €21.95 | €21.95 | €21.95 | 5-7 working days |
| Latvia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Lithuania | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Luxembourg | €11.95 | €31.95 | €31.95 | €31.95 | 5-7 working days |
| Malta | €14.95 | €89.95 | €89.95 | €89.95 | Contact us |
| Monaco | €10.95 | €21.95 | €21.95 | €21.95 | 4-6 working days |
| Poland | €10.95 | €21.95 | €21.95 | €21.95 | 5-7 working days |
| Romania | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Slovakia | €11.95 | €31.95 | €31.95 | €31.95 | 5-7 working days |
| Slovenia | €11.95 | €31.95 | €31.95 | €31.95 | 6-8 working days |
| Spain | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
| Sweden | €11.95 | €26.95 | €26.95 | €26.95 | 5-7 working days |
Returns & withdrawal
Which option you use depends on why you are sending the item back.
Changed your mind?
You have 14 days from receiving your order to withdraw from your purchase. Use our Withdrawal from Contract form to tell us. It is the quickest way, and we will then email you a free returns label.
If you would rather post the item back yourself to our returns address in Ireland, you pay the postage. Full details are on our Returns page.
Withdrawal from ContractFaulty, damaged or wrong item?
If your item arrived faulty, damaged or not what you ordered, please follow the steps on our Returns page. We cover the cost of returning these items.
Full details of all our return options are on that page.
Returns pageDelivery prices are shown in euros and confirmed at checkout.

calcPageSize()); bodyToggle()"
/>