How to Precisely Adjust the Windage Marks of an M1A or M1 Garand with the Front Sight

Published on October 29, 2022
Duration: 7:57

This guide details how to precisely adjust the windage of an M1A or M1 Garand's front sight. It involves calculating the required adjustment based on rear sight corrections, measuring the existing front sight overhang with calipers, and physically moving the front sight to a new, precise position. This is a permanent adjustment for ammunition changes, with field adjustments made via the rear sight.

Quick Summary

To precisely adjust the windage on an M1A or M1 Garand front sight, use dial calipers with a depth gauge at a workbench. Measure the current front sight overhang, calculate the desired adjustment (e.g., 0.030 inches for a 3-inch correction), and then position the front sight to this new measurement before tightening the set screw.

Chapters

  1. 00:06Common M1A/M1 Garand Windage Dilemma
  2. 00:38Understanding Windage Marks and Graduations
  3. 01:00Total Travel and Adjustment Range
  4. 01:17Initial Sighting In at the Range
  5. 01:58Importance of Bench Precision Work
  6. 02:20Click Value: Ten Thousandths of an Inch
  7. 02:35Using Calipers for Measurement
  8. 03:05Goal: Move Front Sight 0.030 Inches
  9. 03:41Measuring Initial Front Sight Overhang
  10. 04:47Calculating Desired Overhang
  11. 05:04Setting Calipers to Adjustment Distance
  12. 05:19Loosening Front Sight Set Screw
  13. 05:48Positioning Depth Gauge and Sliding Sight
  14. 06:13Tightening Front Sight Set Screw
  15. 06:44Finalizing Windage Correction
  16. 06:55Returning Rear Sight to Center

Frequently Asked Questions

How many clicks does each windage graduation represent on an M1A or M1 Garand?

Each graduation mark on the windage scale of an M1A or M1 Garand represents four clicks. This means each click adjusts the sight by 0.001 inches, and each graduation by 0.004 inches.

What is the recommended method for precisely adjusting the front sight windage on an M1A/M1 Garand?

The recommended method involves using dial calipers with a depth gauge at a workbench. This allows for precise measurement of the existing front sight overhang and accurate positioning of the sight after adjustment.

How do you calculate the front sight adjustment needed for an M1A or M1 Garand?

First, determine the required correction at the range (e.g., inches left/right). Convert this to thousandths of an inch. Then, measure the current front sight overhang with calipers, subtract the desired overhang, and set your calipers to this difference to position the new sight.

What is the significance of the front sight 'chasing' the bullet hole?

The principle of the front sight 'chasing' the bullet hole means you move the front sight in the direction you want your shots to impact. If your shots are hitting left, you move the front sight to the right.

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