Holosun HM3X Red Dot Magnifier with QD Mount
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Holosun 3x Magnifier – HM3X
The Holosun HM3X enhances the view through your red dot sights with 3x magnification on demand. This red dot magnifier comes with a QD mount to attach securely to your rifle, with a switch-to-side hinge that easily locks in just with a push or pull. The glass has excellent clarity, with 2.75 inches of eye relief for an ideal eyebox on your AR-15.
Simply attach the HM3X behind your red dot sight, use the flush windage and elevation turrets to center the reticle, and you’re good to go.
Which Red Dot Should I Use?
The HM3X comes usable out of the box with Absolute Cowitness red dot sights, and can be adapted for Lower 1/3 Cowitness using an included spacer. If you’re running a 510C (Absolute Cowitness), you can use the HM3X with no modifications needed. For a 503CU with Lower 1/3 Cowitness, simply add the spacer under the magnifier body.
Features
- 2.75 inches of Eye Relief
- Switch-to-Side QD Mount
- Switchable for Absolute to Lower 1/3 Cowitness using Included Spacer
- Perfect match for Holosun 503CU and 510C Red Dot Sights
Includes
- QD Release Mount
- Lower 1/3 Cowitness Spacer
- T10 Wrench
- User Manual
Specifications
- Magnification: 3x
- Objective Lens Diameter: 28mm
- Eye Relief: 2.75″
- Housing Material: 6061-T6 Aluminum
- Dimensions
- Height: 2.42″
- Width: 1.66″
- Length: 4.03″
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Warranty & returns
90-day no-hassle returns
The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.
If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.














