The Iconic American WW2 Thompson: the M1A1

Published on October 15, 2018
Duration: 17:28

This expert guide details the significant design simplifications made to the M1A1 Thompson submachine gun during World War II, transforming it from the complex 1928A1 model into a more cost-effective and efficient firearm. It highlights key changes like the adoption of a straight blowback action, a simplified bolt, and external modifications to streamline production, as explained by firearms expert Ian McCollum.

Quick Summary

The M1A1 Thompson, the final WW2 iteration, was simplified for mass production. Key changes included a straight blowback action, a fixed firing pin, a right-side charging handle, and a fixed buttstock, drastically reducing complexity and cost compared to the earlier 1928A1 model.

Chapters

  1. 00:00Introduction to the M1A1 Thompson
  2. 01:10Design Simplification by Savage
  3. 02:28Adoption and Evolution (M1 vs M1A1)
  4. 04:27External Changes and Cost Reduction
  5. 06:01Markings and Inspector Stamps
  6. 08:37Internal Comparison: 1928A1 vs M1A1
  7. 10:16Bolt Assembly and Rate of Fire

Frequently Asked Questions

What were the main design changes in the M1A1 Thompson compared to earlier models?

The M1A1 Thompson featured a simplified straight blowback action, a fixed firing pin machined into the bolt, a right-side charging handle, a fixed buttstock, and a simplified pistol grip. These changes drastically reduced production complexity and cost compared to the 1928A1.

Who was George E. Goll and what is his significance on the M1A1 Thompson?

George E. Goll (GEG) was an inspector whose stamp appears on the receiver of many M1A1 Thompson submachine guns. His mark signifies quality control during the manufacturing process, ensuring the firearm met military specifications during its wartime production.

Why was the M1A1 Thompson designed with a simplified action?

The M1A1 Thompson was simplified to meet the urgent demands of World War II production. The goal was to create a more cost-effective and efficient submachine gun by removing complex mechanisms like the Blish lock and streamlining machining processes, allowing for faster and higher volume manufacturing.

What is the difference between the M1 Thompson and the M1A1 Thompson?

The primary difference lies in the firing pin. The M1 Thompson used a separate firing pin, while the M1A1 Thompson featured a fixed firing pin machined directly into the bolt face. This further simplified production and reduced parts count for the M1A1.

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