M1A1 Thompson SBR by Auto-Ordnance

Published on March 16, 2016
Duration: 18:41

This guide details the field stripping process for the Auto-Ordnance Thompson M1A1 SBR, a semi-automatic reproduction of the iconic WWII firearm. The process involves removing the stock, bolt assembly, and trigger group for cleaning and inspection. The host, demonstrating high expertise, highlights the differences between this closed-bolt semi-auto and the original open-bolt machine gun, emphasizing careful reassembly of the striker and disconnector mechanism.

Quick Summary

The Auto-Ordnance Thompson M1A1 SBR is a semi-automatic reproduction with a 10.5-inch barrel, weighing 10.5 lbs and chambered in .45 ACP. Reliability issues were linked to 'limp shouldering,' resolved by a firmer grip. Field stripping involves removing the stock, bolt, and trigger group for maintenance. The M1A1 design simplified earlier models for WWII production.

Chapters

  1. 00:50Introduction to the Thompson M1A1 SBR
  2. 01:35Historical Context of the Thompson Submachine Gun
  3. 03:01M1A1 Design Simplifications Explained
  4. 04:01Range Performance and Initial Reliability
  5. 05:25100-Yard Accuracy and Ergonomics
  6. 08:52Detailed Field Stripping and Internals
  7. 10:38Bolt Assembly and Reassembly Process
  8. 14:20Auto-Ordnance 1911 WWII Replica Overview
  9. 16:19Final Reliability Conclusions and Fixes

Frequently Asked Questions

What are the key features of the Auto-Ordnance Thompson M1A1 SBR?

The Auto-Ordnance Thompson M1A1 SBR is a semi-automatic reproduction featuring a 10.5-inch barrel, walnut stocks, and chambered in .45 ACP. It weighs 10.5 lbs and has a capacity of 20 or 30 rounds. It's a closed-bolt design, differing from the original military select-fire models.

How do you field strip the Auto-Ordnance Thompson M1A1 SBR?

Field stripping involves removing the stock by unscrewing the stock bolt, then removing the bolt assembly. The trigger group is then removed by taking out its pin. Finally, the bolt is separated from the recoil springs for inspection and cleaning.

What caused reliability issues with the Thompson M1A1 SBR in the video?

The primary cause of reliability issues, such as failures to feed, was identified as 'limp shouldering' due to a slippery metal buttplate. When the firearm was held more firmly, it cycled 100% reliably.

What is the historical significance of the Thompson M1A1?

The M1A1 model represents WWII-era simplifications to the original Thompson submachine gun design, aimed at reducing production costs and time. Key changes included fixed sights and the removal of features like the vertical foregrip and Cutts compensator.

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