How to Zero Iron Sights - Sight Calculations Made Simple Feat. Glock 17L

Published on August 16, 2025
Duration: 12:17

This guide details how to zero iron sights on a pistol, focusing on a Glock 17L. It explains the 'FS4' principle for sight adjustments, the importance of measuring sight radius and deviation, and provides a mathematical method to calculate precise sight corrections for both elevation and windage. The video demonstrates practical techniques using tools like calipers and files for DIY adjustments.

Quick Summary

To zero iron sights, first measure your sight radius and the deviation of your shot group from the point of aim. Use the FS4 principle (Front Opposite, Rear Same) to determine adjustment direction. Calculate the required correction by dividing the deviation by the sight radius factor, then adjust your sights accordingly.

Chapters

  1. 00:00Introduction to Zeroing Iron Sights
  2. 00:05Pistols with Fixed vs. Dovetailed Sights
  3. 00:56Choosing Zero Distance and Target
  4. 01:28Example: Glock 17L Zeroing Scenario
  5. 02:00The FS4 Principle Explained
  6. 03:44Measuring for Sight Correction Calculations
  7. 04:15Measuring Sight Radius
  8. 04:39Calculating Sight Radius Factor
  9. 05:10Calculating Elevation Sight Correction
  10. 06:09Adjusting Rear Sight for Elevation
  11. 06:45Calculating Windage Sight Correction
  12. 07:05Adjusting Rear Sight for Windage
  13. 07:39Using a Sight Pusher for Precision
  14. 08:21Tips for Filing Down Rear Sights
  15. 10:05Post-Adjustment Testing and Ammunition
  16. 11:23Summary of Zeroing Results
  17. 11:34Conclusion and DIY Options

Frequently Asked Questions

What is the FS4 principle for adjusting pistol sights?

The FS4 principle stands for Front Opposite, Rear Same. It means moving the front sight changes the point of impact in the opposite direction, while moving the rear sight changes the point of impact in the same direction. This is crucial for accurate sight adjustments.

How do you calculate the required sight correction for elevation?

To calculate elevation correction, divide the vertical deviation of your shot group from your point of aim (in inches) by your calculated sight radius factor. This gives you the precise amount, in inches, to adjust your sights.

What tools are needed to zero iron sights on a pistol?

Essential tools include a ruler or scale (at least 12 inches) for measuring sight radius, dial calipers or a depth micrometer for precise measurements, and potentially a brass punch or sight pusher for making adjustments. Files are also needed for DIY modifications.

What is the sight radius and why is it important for zeroing?

The sight radius is the distance between the rear sight and the front sight. It's critical for zeroing because it's used in calculations to determine how much to move the sights to correct for deviations in point of impact, based on the distance to the target.

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