How to Install M1A Gas Shims ~ and Without Stupid Castle Nut Pliers!

Published on October 11, 2022
Duration: 26:14

This guide details the process of installing gas tube shims on a Springfield Armory M1A rifle to correct looseness and improve accuracy. The instructor demonstrates how to remove the flash hider and gas nut, measure for the correct shim thickness, and reinstall components without specialized castle nut pliers. The process emphasizes achieving a snug fit that prevents binding, especially as the barrel heats up.

Quick Summary

Installing M1A gas shims is a key step to improve accuracy by eliminating gas tube looseness. You'll need basic tools like Allen wrenches, a screwdriver, and a mallet. Specialized castle nut pliers aren't required; a screwdriver and light taps can suffice. The process involves trial and error to find the correct shim thickness for a snug, non-binding fit.

Chapters

  1. 00:03Introduction & Previous Work
  2. 00:44Purpose: Tightening Gas Tube for Accuracy
  3. 01:08Required Tools and Materials
  4. 02:00Alternative to Castle Nut Pliers
  5. 04:03Badger Ridge Industries Shim Set Review
  6. 06:05Removing the Flash Hider
  7. 08:33Removing the Gas Nut
  8. 08:52Assessing Gas Tube Looseness
  9. 09:17Measuring for Shim Thickness (Feeler Gauges)
  10. 11:50Selecting Shim Combination (Trial 1)
  11. 14:16Trial and Error: Adjusting Shim Thickness
  12. 17:15Selecting Shim Combination (Trial 2)
  13. 18:10Final Shim Installation and Seating
  14. 19:19Reinstalling Gas Nut and Barrel Band
  15. 19:42Lubrication and Reinstalling Flash Hider
  16. 21:13Securing the Castle Nut (Screwdriver Method)
  17. 22:48Concluding Thoughts & Hunting Mention
  18. 23:38Praise for Badger Ridge Industries
  19. 24:39Thanks to Patreon Donors
  20. 25:10Future Plans: Range Testing

Frequently Asked Questions

What tools are needed to install M1A gas shims?

You'll need a 1/16-inch Allen wrench, a 3/8-inch wrench, a screwdriver, and a plastic mallet or light hammer. Optional but helpful are feeler gauges. Badger Ridge Industries gas shims are recommended.

Can I install M1A gas shims without specialized castle nut pliers?

Yes, the instructor demonstrates how to use a screwdriver and a light tap with a mallet to engage the castle nut, a practical alternative to expensive pliers for this specific task.

How do I determine the correct thickness for M1A gas shims?

The process involves trial and error. You'll install shims, reassemble the gas tube nut, and check for a snug fit that goes slightly past 'dead center' without binding, especially considering barrel heat expansion.

Where can I buy quality M1A gas shims?

The video highly recommends Badger Ridge Industries for their M1A gas shims. They offer a color-coded set with six shims for a good price, which is beneficial for finding the exact fit needed.

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