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

Published on July 23, 2018
Duration: 5:02

The M3A1 Grease Gun, a WWII-era submachine gun, was developed as a cheaper, simpler alternative to the Thompson. Its design evolved to the M3A1, removing the crank handle for a finger hole cocking mechanism. Originally inexpensive to produce, registered M3A1s are now rare and costly collector's items.

Quick Summary

The M3A1 Grease Gun evolved from the M3, simplifying the design by removing the cocking crank and adding a finger hole to the bolt for easier operation. It served as the standard US submachine gun in the Korean War and saw use through Vietnam.

Chapters

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

Frequently Asked Questions

What was the purpose behind the development of the M3 Grease Gun?

The M3 Grease Gun was developed at the start of WWII as a simpler, cheaper, and more easily manufactured alternative to the expensive and heavy Thompson submachine gun used by the US military.

How did the M3A1 Grease Gun differ from the original M3?

The M3A1 simplified the M3's design by removing the external crank handle used to cock the bolt. Instead, a finger hole was machined directly into the bolt, allowing the operator to manually pull it back.

What is the service history of the M3A1 Grease Gun?

The M3A1 became the standard US submachine gun during the Korean War and continued to see service through the Vietnam War, remaining with some National Guard units until the 1990s.

Are M3A1 Grease Guns common and inexpensive today?

No, legally registered M3A1 Grease Guns are rare and significantly more expensive today. While originally costing under $21 to produce, their limited supply makes them prized collector's items.

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