Holosun HM3X Magnifier
Price includes VAT
A compact 3x magnifier with a quick-detach, flip-to-side Picatinny mount for fast transitions between magnified and unmagnified shooting. The Holosun HM3X pairs with red dot and reflex sights and ships with a spacer for both absolute and lower 1/3 co-witness heights.
Description
Key Features:
3x fixed magnification: extends red dot engagement range for target identification at distance.
Quick-detach, ambidextrous flip-to-side mount for instant transitions between 1x and 3x.
Absolute and lower 1/3 co-witness compatibility via included spacer.
70 mm eye relief and 7.6 mm exit pupil: comfortable sight picture with a wide 7° field of view.
IP67-rated and nitrogen-purged aluminium housing for fog-proof, waterproof performance.
Windage and elevation adjustments (0.5 MOA per click, ±50 MOA travel) for precise alignment with your primary optic.
±3 dioptre adjustment to fine-tune focus for individual eyesight.
Red dot sights are fast at close quarters, but there are times when a little extra reach makes all the difference, confirming a target at distance, reading fall of shot, or simply getting a clearer picture of what you're looking at. The HM3X is a 3x magnifier built to sit behind your red dot and flip into the sight line only when you need it.
The flip-to-side mount is quick-detach and fully ambidextrous, so the magnifier swings clear in a single motion when you want to revert to unmagnified shooting. A lower 1/3 co-witness spacer is included alongside the standard-height mount, which means the HM3X will line up correctly with most common red dot mounting configurations without needing to source additional parts.
Optical quality is strong for the price point. A 70 mm eye relief keeps the sight picture comfortable and forgiving on head position, while a 7.6 mm exit pupil and 7° field of view make target acquisition straightforward. The ±3 dioptre adjustment ring lets you dial the focus to suit your own eyesight. A worthwhile feature for shooters who wear corrective lenses or find themselves squinting through other magnifiers.
Holosun have built the housing from aluminium with an MAO surface finish, nitrogen-purged the internals to prevent fogging, and sealed it to IP67 for full dust and water protection. Windage and elevation adjustments are included so you can align the magnifier precisely with your primary optic, and a multi-tool for those adjustments comes in the box.
A well-judged magnifier for rifle and carbine shooters who want to extend the capability of an existing red dot setup without adding excessive weight or complexity.
Specifications
| Magnification | 3x |
| Eye Relief | 70 mm |
| Exit Pupil | 7.6 mm |
| Field of View | 7 ° |
| Dioptre Range | ±3 |
| Light Transmittance | 75 % |
| Click Value | 0.5 MOA |
| Windage / Elevation Range | ±50 |
| Housing Material | Aluminium |
| Surface Finish | MAO |
| Weight | 278 g |
| Dimensions | 102 x 43 x 64 mm |
| Mount Type | Picatinny |
| Quick Detach | Yes |
| Flip to Side | Yes |
| Ambidextrous | Yes |
| Cowitness Heights | Absolute, Lower 1/3 |
| IP Rating | IP67 |
| Nitrogen Purged | Yes |
| Shock Rating | 1000 G |
| Working Temp Min | -30 °C |
| Working Temp Max | 60 °C |
Frequently Asked Questions
Is the flip-to-side mount left-handed friendly?
Yes, the mount is fully ambidextrous. It can be configured to flip to either side, so it works equally well for right- and left-handed shooters.
How do I adjust the HM3X to match my red dot's zero?
The magnifier has built-in windage and elevation adjustments (0.5 MOA per click, ±50 MOA travel). Use the multi-tool included in the box to fine-tune alignment until the magnified image sits centred on your red dot's point of aim.
Is the Holosun HM3X waterproof?
It is IP67 rated, meaning it is fully sealed against dust and can withstand temporary submersion in water up to one metre deep. The internals are nitrogen-purged to prevent fogging in cold or wet conditions.
What red dot sights is the Holosun HM3X compatible with?
The HM3X is designed to work with any red dot or reflex sight mounted on a Picatinny rail. It ships with a spacer that lets you set it up at either absolute co-witness or lower 1/3 co-witness height, so it will align with most common red dot mounting configurations, including Holosun's own 400 and 500 series sights, as well as those from other manufacturers.
What does the included spacer do?
Without the spacer fitted, the HM3X sits at absolute co-witness height. Adding the spacer raises it to lower 1/3 co-witness. Which you need depends on how your red dot is mounted. If your red dot uses a lower 1/3 riser, fit the spacer so the magnifier lines up with it.
What is the difference between the HM3X and the HM3XT?
The HM3XT is a titanium-housed version of the same magnifier. The optical specs are largely the same, but the titanium housing is lighter and more durable. The HM3X uses an aluminium body with an MAO finish, which keeps the price lower while still offering IP67 water resistance and 1,000G shock rating.
Can I use the HM3X on an air rifle?
Yes. As long as the rifle has a Picatinny rail, the magnifier will mount directly. The 1,000G shock rating means it will comfortably handle the recoil from spring-powered and gas-ram air rifles, which can be harder on optics than centrefire firearms.
Customer Reviews
Based on 0 reviews
Sign in to write a review
No reviews yet
Be the first to share your experience
Delivery & Returns
Shipping & Delivery
At Shooting Supplies, we keep our delivery pricing straightforward. We use a flat-rate shipping model, meaning you pay the same consistent price regardless of the size of your order.
| Destination | Delivery Rate |
|---|---|
| Standard UK (Mainland) | £6.95 |
| Northern Ireland | £10.00 |
- Postcode Calculation: Shipping costs are finalised at checkout once your delivery address is confirmed.
- Heavy Goods: Specialised items, such as gun safes, require bespoke shipping arrangements. Costs for these items can exceed £70; please contact us directly for a custom delivery quote.
- Dispatch Times: We aim to process and dispatch all orders within 48 hours. While most customers receive their items within 2–3 business days, please note that certain specialised products may require additional handling time.
- Multiple Shipments: To get your gear to you as quickly as possible, we may ship your order in separate installments if items are coming from different locations.
- Redirection & Refusals: Please ensure your delivery details are accurate. Redirecting a package in transit or failing to collect an order may result in additional handling fees.
In-Store Stock & Collection
- Store Inventory:Items listed as “In Stock” are stocked at our Bromsgrove store. These usually arrive within 2–3 days. If you plan to visit us in person, we recommend calling ahead to ensure availability, 01527 831 261.
- Restricted Items (Collection Only): Specific products, including shotguns, rifles, airguns, and moderators, cannot be shipped to residential addresses. These require in-person collection with valid identification (Passport) or a relevant Firearms/Shotgun Certificate.
Returns & Refunds
We want you to be satisfied with your purchase. If you change your mind, you have 14 days from your cancellation notice to return the goods to us.
Return Conditions
To be eligible for a refund, items must be:
- Returned in their original, unopened packaging.
- In a “as new” condition suitable for resale.
- Securely packaged to prevent damage during transit.
Note: These conditions do not apply to faulty goods. For non-faulty returns, the cost of shipping and recovery remains the responsibility of the customer.
How to Return
Please ensure that you include your order number and contact details, and that our return address is clearly labeled on the exterior of your package:
Shooting Supplies Ltd38 Sherwood Road
Bromsgrove
B60 3DR
For any questions regarding your delivery or a potential return, please contact our team at 01527 831 261.
Security & Payments
Secure Checkout
All transactions on our website are processed through a fully encrypted, SSL-secured connection. Your personal and payment details are never stored on our servers.
Payments are handled by Worldpay, one of the UK’s leading payment processors, providing bank-grade security for every order.
Accepted Payment Methods
- —Visa & Visa Debit
- —Mastercard & Maestro
- —American Express
- —Finance (on orders over £250 — see Finance section below)
Your Data & Privacy
Your data is used solely to process your order and will never be sold or shared with third parties for marketing purposes. For full details, please refer to our Privacy Policy.
Finance
Spread the Cost
You can spread the cost of most products on orders over £250 with our flexible finance options. Finance is offered by BuyLine Ltd.
Use the finance calculator on this page to explore deposit and repayment options and see estimated monthly payments before you apply.
Key Terms
| APR (Fixed) | 21.9% |
| Minimum Order | £250 |
| Deposit | 10%–50% |
| Repayment Terms | 24–48 months |
Eligibility
- —You must be a UK resident aged 18 or over.
- —Finance is subject to status and credit approval.
- —The application process includes a credit check.
- —For more information on credit checks, visit the Money Advice Service.
Shooting Supplies Ltd is a credit broker, not a lender, and is authorised and regulated by the Financial Conduct Authority (FRN pending). We do not charge you for credit broking services. Finance is provided by BuyLine Ltd through the BuyLine platform.
Values provided by the finance calculator are indicative only and do not constitute an offer of finance. Final repayments may vary slightly.