Why did the suppressed Thompson lose out to the Sten? With firearm & weapon expert Jonathan Ferguson

Published on July 24, 2024
Duration: 18:37

This video compares a suppressed Thompson M1A1 prototype with the Sten Mk.IIS, detailing the Thompson's unique suppressor design and modifications. Despite comparable muzzle noise, the Thompson's significantly louder mechanical action and heavier, longer profile led to its abandonment in favor of the M3 Grease Gun in 1944 trials.

Quick Summary

The suppressed Thompson M1A1 lost out to the Sten Mk.IIS and M3 Grease Gun due to its significantly louder mechanical action noise and heavier, longer profile (12 lbs, 40.6 inches), despite comparable muzzle suppression.

Chapters

  1. 00:00Intro: Suppressed Thompson M1A1
  2. 00:41Suppressor Design: Sten Mk.IIS Adaptation
  3. 02:13Internal Baffles & Felt Pad
  4. 03:14Barrel Mods & Suppressor Attachment
  5. 04:42Ballistics & Gas Management (.45 ACP)
  6. 06:10Historical Context: 1944 vs. 1942
  7. 07:59Development Goals: Convertible Weapon
  8. 09:20Trial Results: Thompson vs. Sten/M3
  9. 12:08Why the Thompson Lost: Weight & Length

Frequently Asked Questions

Why was the suppressed Thompson M1A1 abandoned during WWII trials?

The suppressed Thompson was abandoned primarily due to its excessive weight (12 lbs) and length (40.6 inches) compared to alternatives like the Sten Mk.IIS. Its mechanical action noise was also significantly louder than the Sten's, despite comparable muzzle suppression.

What was the design basis for the suppressed Thompson's suppressor?

The suppressor for the Thompson M1A1 prototype was an adaptation of the Sten Mk.IIS pattern. It featured a 1.5-inch diameter blued steel tube, though the assembly was noted as a 'rough and ready' prototype.

How did the suppressed Thompson compare acoustically to the Sten?

In 1944 trials, the suppressed Thompson's muzzle noise was found to be comparable to the Sten Mk.IIS. However, the Thompson's internal mechanical action produced significantly more noise, making it less stealthy overall.

What modifications were made to the Thompson M1A1 for suppression?

The Thompson's barrel was shortened from 12 to 10 inches, removing the front sight. A unique suppressor, adapted from the Sten Mk.IIS, was attached via a single screw mechanism.

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