The Iconic American WW2 Thompson: the M1A1

Published on October 15, 2018
Duration: 17:28

The M1A1 Thompson represents a significant simplification of the iconic WW2 submachine gun, designed for mass production. Key changes include the removal of the Blish lock in favor of a straight blowback action and a fixed firing pin, reducing machining time and cost. External modifications like a fixed buttstock and simplified grip further streamlined production, making it a more efficient military firearm.

Quick Summary

The M1A1 Thompson simplified the iconic submachine gun for WW2 mass production by removing the Blish lock in favor of a straight blowback action and a fixed firing pin. External changes included a fixed buttstock and simplified grip, reducing manufacturing complexity and cost.

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 simplified the design by removing the complex Blish lock system in favor of a straight blowback action. It also featured a fixed firing pin machined into the bolt, a fixed buttstock, and a simplified grip to reduce production costs and complexity.

Why was the M1A1 Thompson developed?

The M1A1 was developed during World War II as a more cost-effective and easier-to-manufacture version of the iconic Thompson submachine gun. The U.S. government needed a simpler design to meet mass production demands.

What is the significance of the M1A1's blowback action?

The M1A1's transition to a straight blowback action, replacing the Blish lock, significantly simplified its internal machining. This change impacted its rate of fire, initially increasing it before being regulated by the fixed firing pin design.

What external modifications were made to the M1A1 for production efficiency?

To speed up manufacturing, the M1A1 featured a fixed buttstock instead of a removable one, a simplified pistol grip, and removed slots for drum magazines. It was designed to primarily use 20 and 30-round stick magazines.

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