The Holosun HS403C and HM3X Combo (HS403C-HM3X) pairs the HS403C 20 mm micro red dot sight — a 2 MOA red dot with Solar Failsafe and 12 brightness settings — with the HM3X 3x flip-to-side magnifier, both units supplied with mounts. UPC 810047071624.
This is the value route into a complete red dot and magnifier setup. The HS403C is the compact 20 mm micro dot: a clean 2 MOA aiming point, solar backup, Shake Awake and up to 50,000 hours from a CR2032, and it ships with both absolute and lower-1/3 mounts so it can be set at whichever height suits the rifle. The HM3X adds 3x behind it with 2.75 in eye relief, an adjustable dioptre and an ambidextrous quick-detach flip mount with a co-witness spacer. Both units are 6061-T6 aluminium and rated IP67.
How It Compares
For a much wider window and the switchable circle-dot reticle, the HS510C and HM3X combo is the step up. The magnifier is sold separately as the HM3X 3x magnifier, with the HM3XT titanium 3x magnifier and the HM6X 6x magnifier as the upgrades. Browse all red dot and magnifier combos and every Holosun rifle red dot sight we stock.
Ideal For
- A first red dot and magnifier setup bought as a matched, budget-conscious pair
- Civilian Service Rifle and practical rifle on straight-pull AR-pattern carbines
- Lightweight micro-dot builds where a full-size window is not wanted
- Rimfire and pistol-calibre carbines running a Picatinny rail
Key Features
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Sight: HS403C 20 mm micro red dot sight with a 2 MOA red dot
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Magnifier: HM3X 3x with 2.75 in eye relief and an adjustable dioptre
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Electronics: Solar Failsafe supplemental power plus Shake Awake motion activation
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Battery: CR2032, up to 50,000 hours of runtime
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Illumination: 12 brightness settings on the HS403C
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Sight mounts: absolute co-witness and lower-1/3 mounts both included
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Magnifier mount: ambidextrous quick-detach flip-to-side with co-witness spacer
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Build: 6061-T6 aluminium, IP67 rated on both units
Technical Specifications
| Kit Contents |
HS403C micro red dot sight and HM3X 3x magnifier |
| Red Dot |
HS403C — 2 MOA red dot, 20 mm micro, 12 brightness settings |
| Magnifier |
HM3X — 3x, 2.75 in eye relief, adjustable dioptre |
| Battery |
CR2032, up to 50,000 hours |
| Power |
Battery with Solar Failsafe supplemental power |
| Power Management |
Shake Awake motion activation |
| Sight Mounts |
Absolute co-witness and lower-1/3, both included |
| Magnifier Mount |
Quick-detach flip-to-side with co-witness spacer |
| Housing |
6061-T6 aluminium |
| Water Resistance |
IP67 on both units |
| MPN / UPC |
HS403C-HM3X / 810047071624 |
What's Included
- Holosun HS403C micro red dot sight with absolute and lower-1/3 mounts
- Holosun HM3X 3x magnifier with quick-detach flip mount and co-witness spacer
- Lens cloths, multi-tools and user manuals
UK Delivery & Support
Imported from the USA, duty paid by us, and dispatched tracked from the UK — nothing to pay on delivery — backed by UK-based support.
Frequently Asked Questions
What is included in the Holosun HS403C and HM3X combo?
The Holosun HS403C and HM3X Combo includes the HS403C 20 mm micro red dot sight with both absolute co-witness and lower-1/3 mounts, and the HM3X 3x magnifier with its quick-detach flip-to-side mount and co-witness spacer.
What reticle does the HS403C in this combo use?
The HS403C uses a single 2 MOA red dot with 12 brightness settings. It is a plain dot rather than a switchable circle-dot, which keeps the sight picture as clean as possible.
What is Solar Failsafe on the HS403C?
Solar Failsafe is a solar panel that powers the dot in bright light and backs up the CR2032 battery, so the Holosun HS403C keeps running in daylight even with a flat cell.
Can the magnifier be removed?
Yes. The HM3X in the Holosun HS403C and HM3X Combo has a quick-detach lever that takes it off the rail in seconds, and it flips aside for unmagnified 1x shooting without removing it at all.
How is this combo different from the HS510C and HM3X combo?
The Holosun HS403C and HM3X Combo uses a compact 20 mm micro dot with a single 2 MOA reticle. The HS510C and HM3X Combo pairs the same magnifier with a much wider-window open reflex sight running the Multi-Reticle System.
How tough are the units in this combo?
Both the HS403C and the HM3X in this combo are built from 6061-T6 aluminium and rated IP67 for water and dust resistance.
