Fitting a 1911 Thumb Safety on RECOILtv DIY (full episode)

Published on September 29, 2016
Duration: 6:08

This guide details the process of fitting an oversized 1911 thumb safety, as demonstrated by expert gunsmith Jason Burton of Heirloom Precision. The procedure involves carefully filing the safety's lobe to achieve a precise fit with the sear, emphasizing iterative testing and safety checks. Proper installation ensures reliable function and safety engagement.

Quick Summary

Fitting an oversized 1911 thumb safety involves carefully filing the lobe with a #2 fine-cut file to precisely match the sear interface. Expert gunsmith Jason Burton emphasizes slow, iterative filing and frequent testing to achieve a snug, functional fit without over-cutting. Always ensure the firearm is unloaded and perform thorough function checks post-installation.

Chapters

  1. 00:00Introduction
  2. 00:26Required Tools
  3. 00:59Initial Fitting
  4. 01:41Filing the Lobe
  5. 03:22Iterative Testing
  6. 04:43Safety Function Checks
  7. 05:50Conclusion

Frequently Asked Questions

What tools are needed to fit a 1911 thumb safety?

You will need a #2 fine-cut file for precise material removal, a bench block for support, the 1911 pistol itself, and the new thumb safety you intend to fit. Ensuring the firearm is unloaded is paramount before starting.

Why won't a new 1911 thumb safety fit immediately?

New, custom-fit thumb safeties often have an oversized lobe designed to interface with the sear. This intentional oversizing allows a gunsmith to precisely file it down for a perfect, tight fit, ensuring reliable function.

What is the key technique for filing a 1911 thumb safety lobe?

The technique involves taking slow, single file strokes with a fine-cut file, constantly re-testing the fit. The goal is to create a flat surface parallel to the sear's relief cut without removing too much material.

How do you test the function of a fitted 1911 thumb safety?

After fitting, test that the hammer cannot fall when the safety is in the 'on' position. Then, ensure the hammer falls freely when the safety is moved to the 'off' position. Live fire testing is recommended for final confirmation.

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