Slow Motion: M1 Thumb (Ouch!)

Published on November 5, 2015
Duration: 1:07

This video demonstrates the dangerous 'M1 Thumb' injury caused by the M1 Garand's bolt slamming forward. It explains the mechanism: when empty and locked open, only the follower holds the bolt, and pushing it down without securing the charging handle allows the bolt to close. A specific technique using the heel of the hand to hold the charging handle while manipulating the follower is shown to prevent this injury.

Quick Summary

The 'M1 Thumb' injury on an M1 Garand occurs when the bolt slams forward. This happens because the follower holds the bolt back when empty. To prevent it, secure the charging handle with your palm's heel while pushing the follower down with your thumb.

Chapters

  1. 00:00Introduction: M1 Thumb Injury
  2. 00:15The Injury Mechanism Explained
  3. 00:33Mechanical Cause of M1 Thumb
  4. 00:51How to Prevent M1 Thumb Injury

Frequently Asked Questions

What causes the 'M1 Thumb' injury on an M1 Garand?

The M1 Thumb injury occurs when the bolt slams forward unexpectedly. This happens because when the rifle is empty and locked open, only the follower holds the bolt back. Pushing the follower down without securing the charging handle allows the bolt to close forcefully on the thumb.

How can I prevent getting 'M1 Thumb' when handling an M1 Garand?

To prevent M1 Thumb, use the heel of your right hand to hold the charging handle fully back. While holding it there, use your right thumb to push the follower down. This ensures the bolt cannot move forward until your hand is clear.

What is the function of the follower in the M1 Garand's bolt mechanism?

In an empty M1 Garand locked open, the follower plays a critical role by holding the bolt carrier group to the rear. Releasing the follower without restraining the bolt handle allows the bolt to slam forward, which can cause the 'M1 Thumb' injury.

Why is slow-motion footage useful for understanding the M1 Thumb injury?

Slow-motion footage allows viewers to clearly see the rapid sequence of events that lead to the M1 Thumb injury. It highlights how the follower releases the bolt and how quickly the bolt slams forward, making the mechanism and the danger much easier to comprehend.

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