The Holosun HM3X is a 3x flip-to-side magnifier that instantly extends the reach of any red dot or holographic sight — flip it in for magnified target ID at distance, then swing it aside for 1x speed up close. It's one of the best-value magnifiers on the market.
It sits on a QD flip-to-side mount with a spacer for absolute or lower 1/3 co-witness, has an adjustable diopter for a sharp picture, and is built from rugged aluminium.
How It Compares
The HM3X pairs perfectly with Holosun dots like the HS510C — or grab them together in the HS510C + HM3X combo and save. Want more reach? Step up to a 5x or 6x model in red dot sight magnifiers. Not sure which to pick? Read our guide to choosing a magnifier. Building an AR? See AR-15 optics.
Ideal For
- Close-to-mid range shooting
- Tactical and duty applications
- Hunting setups
- Competitive shooting and range training
Key Features
- 3x magnification — balances speed and reach
- QD flip-to-side mount for rapid 1x transitions
- Adjustable diopter to fine-tune focus
- Wide field of view for situational awareness
- Windage & elevation adjustment for alignment
- Durable aluminium housing, water- and fog-resistant
Technical Specifications
| Magnification |
3x |
| Objective Lens |
22 mm |
| Eye Relief |
2.75 in |
| Field of View |
7° |
| Diopter Adjustment |
Yes |
| Mount Type |
QD flip-to-side |
| Mount Height |
Absolute & lower 1/3 co-witness compatible |
| Housing / Finish |
Aluminium / Black |
| Water & Fog Resistant |
Yes |
| Length |
3.4 in |
| Weight |
9.8 oz |
What's Included
- Holosun HM3X 3x Magnifier
- QD flip-to-side mount
- Spacer for lower 1/3 co-witness
- Adjustment tool
- User manual
Compatibility
Works with most standard red dot and holographic sights at a compatible mounting height, including Holosun, Aimpoint, EOTech and SIG Sauer optics — just check the dot sits centred in the magnifier's view.
UK Delivery & Support
The HM3X is UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based aftersales support and Holosun's warranty.
Frequently Asked Questions
Will the HM3X work with my red dot?
Most flip-to-side magnifiers work behind any red dot or holographic sight at a compatible height; the included spacer supports absolute and lower 1/3 co-witness.
Does a magnifier have its own reticle?
No — it magnifies the existing reticle of your red dot or holographic sight (the dot will appear larger too).
3x or 5x — which should I choose?
3x is the most versatile and forgiving on the eye box; step up to 5x or 6x only if you regularly shoot at longer distances.
Can I quickly remove it?
Yes — the QD flip-to-side mount lets you swing it aside for 1x or detach it entirely in seconds.
