I Have This Old Gun: U.S. M3A1 Grease Gun

Published on July 23, 2018
Duration: 5:02

This guide details the specific technique for cocking the M3A1 Grease Gun, a simplified evolution from the M3 model. It highlights the removal of the crank handle and the introduction of a finger hole in the bolt for easier operation. The information is presented with high authority, drawing from experts like a Retired Museum Curator and editors from American Rifleman.

Quick Summary

The M3A1 Grease Gun, a simplified evolution of the M3, replaced the crank handle with a finger hole in the bolt for easier cocking. It served as the standard U.S. submachine gun in the Korean War and saw continued use through Vietnam, becoming a prized collector's item today due to its historical significance and rarity.

Chapters

  1. 00:00Introduction: M3A1 Grease Gun
  2. 00:49M3 Design & Weaknesses
  3. 01:43M3A1 Evolution & Cocking
  4. 02:55Service History: Korea to Vietnam
  5. 03:43Collector Appeal & Legacy
  6. 04:36Modern Rarity & Cost

Frequently Asked Questions

What was the main advantage of the M3A1 Grease Gun over the original M3?

The M3A1 Grease Gun simplified the design by removing the crank handle found on the M3. Instead, it featured a finger hole machined into the bolt, allowing the operator to cock the weapon more easily and reliably.

What is the historical significance of the M3A1 Grease Gun?

The M3A1 Grease Gun was developed as a cheaper, simpler alternative to the Thompson submachine gun. It became the standard submachine gun for the U.S. during the Korean War and saw service through Vietnam, remaining in use with some units until the 1990s.

Why are M3A1 Grease Guns rare and expensive today?

Legally registered M3A1 Grease Guns are rare due to their limited production numbers and the fact that many were destroyed or demilitarized. Their historical significance and collector appeal, combined with NFA regulations, drive up their market value considerably.

How is the M3A1 Grease Gun cocked?

The M3A1 Grease Gun is cocked by inserting an index finger into the finger hole machined into the bolt and pulling the bolt rearward. This replaced the crank handle found on the earlier M3 model.

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