The Marines' First SMG: 1921/28 Thompson Gun

Published on October 9, 2018
Duration: 13:45

This video details the evolution of the Thompson submachine gun, focusing on the 1921/28 overstamp model. It highlights the modifications made to reduce the rate of fire from 800 to 600 RPM for the US Navy, primarily by adding weight to the actuator. The historical context of its limited early sales and eventual adoption by various US military and law enforcement branches is explored, alongside its high historical price point.

Quick Summary

The 1928 Thompson SMG was developed by overstamping existing 1921 models to reduce the rate of fire to 600 RPM for the US Navy. Modifications included adding weight to the actuator and using a stronger recoil spring, making it a significant historical firearm.

Chapters

  1. 00:00Introduction: 1921/28 Thompson SMG
  2. 00:34Early Sales & Limited Civilian Market
  3. 01:47USMC & Navy Interest: Rate of Fire Needs
  4. 03:32The 1928 Model: Overstamping & Navy Markings
  5. 05:30Internal Modifications: Reducing Rate of Fire
  6. 06:321921 vs 1928 Internals Comparison
  7. 08:38Firing Mechanism: Hammer on Bolt Safety
  8. 09:15Later Adoption: Cavalry, FBI
  9. 10:56Historical Price & Economic Context

Frequently Asked Questions

What modifications were made to create the 1928 Thompson model?

The 1928 Thompson was created by overstamping existing 1921 models. Key modifications included adding weight to the actuator, designed by Oscar Payne, to reduce the rate of fire from 800 to 600 RPM, and a stronger, smaller-diameter recoil spring.

Why did the US Navy request a lower rate of fire for the Thompson?

The US Navy tested the Thompson submachine gun in 1927 and requested a lower rate of fire. This led Auto-Ordnance to modify existing 1921 models into the 1928 configuration to meet this requirement without producing entirely new firearms.

How did the 1928 Thompson differ internally from the 1921 model?

Internally, the 1928 Thompson featured a heavier actuator, achieved by adding metal, and a stronger, smaller-diameter recoil spring compared to the 1921 model. These changes were implemented to reduce the cyclic rate of fire.

Was the Thompson submachine gun expensive when it was first released?

Yes, the Thompson was very expensive. In the late 1920s, it cost around $200, which was roughly equivalent to a month's salary for the average middle-class American, making it a significant purchase.

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