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How do I zero my Holosun HS403R red dot sight for optimal accuracy?

1Answers
LaAllie
12/17/2025, 10:11:35 AM

Zeroing your Holosun HS403R red dot sight is a straightforward process. Here's how to do it for accurate shooting:

  1. Safety First: Before you start, make absolutely sure your firearm is unloaded and pointed in a safe direction.

  2. Initial Setup: The HS403R is factory-adjusted for a 25-yard zero, so you'll want to start there. This means your first shots should generally land close to the center.

  3. Adjusting Windage and Elevation: The elevation turret is on top of the sight, and the windage turret is on the right side. You'll use the built-in screwdriver tool, found on the protective cap, to make adjustments.

  4. Making Adjustments to Point of Impact:

    • Unscrew and remove the protective cap from the adjustment turret.
    • Use the slot-type screwdriver (the one built into the cap) to turn the turret.
    • Each click on either the elevation or windage turret moves your point of impact by 0.5 MOA (Minute of Angle).
    • To move your shots UP, turn the elevation turret counterclockwise. To move your shots RIGHT, turn the windage turret counterclockwise. Clockwise adjustments will move your point of impact in the opposite directions.

  5. Important Caution: Don't force the turrets. If you feel resistance, you've likely reached the adjustment limit. Forcing it can damage the sight. If you need more adjustment than the turrets allow, consider adding a shim or spacer between the sight and the mounting rail. Following these steps will help you achieve a precise zero with your Holosun HS403R.

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