AR15 Holosun HS403A Red Dot Sight

Published on December 18, 2014
Duration: 4:10

This review of the Holosun HS403A red dot sight highlights its budget-friendly approach to T1-style features. Key takeaways include its included AR riser mount, the unique under-mount battery compartment requiring disassembly, and an innovative auto-wake function. However, a notable drawback is significant internal lens glare, and compatibility issues arise when using magnifiers, causing alignment shifts.

Quick Summary

The Holosun HS403A red dot sight provides budget-friendly T1-style features, including an AR riser mount, push-button illumination, and an auto-wake function. However, it suffers from internal lens glare and can exhibit alignment issues when paired with magnifiers, impacting long-range accuracy. Battery changes require removing the mount.

Chapters

  1. 00:28Introduction & Budget T1 Features
  2. 00:53Included Mounts & Design
  3. 01:15Battery Compartment Design
  4. 01:25Illumination & Auto Wake
  5. 01:49Reticle & Glass Quality
  6. 02:18Magnifier Compatibility Test
  7. 02:37Magnifier Test Results
  8. 03:05Shotgun Zero Test
  9. 03:34Weaknesses & Overall Value

Frequently Asked Questions

What are the main features of the Holosun HS403A red dot sight?

The Holosun HS403A offers T1-style features at a budget price, including an AR riser mount for lower 1/3 co-witness, a low mount for other platforms, push-button illumination, an 8-hour auto-shutoff, and an innovative auto-wake function that turns the sight on when the rifle is handled.

What are the drawbacks of the Holosun HS403A red dot sight?

A significant drawback is internal lens glare, particularly noticeable when the sun is behind the user. Additionally, when used with a magnifier like the EOTech G33, alignment issues can arise, causing the reticle to shift and impacting long-range accuracy.

How is the battery compartment designed on the Holosun HS403A?

The battery compartment is located underneath the four mounting screws. This design means that to change the battery, you must remove the entire mount from the firearm, which is an unusual and less convenient approach compared to side-loading battery compartments.

Does the Holosun HS403A hold zero on different firearms?

Yes, the Holosun HS403A has been tested and demonstrated the ability to hold zero effectively on a shotgun, even after firing both birdshot and slugs, indicating good durability and zero retention.

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