M1A1 Thompson SBR by Auto-Ordnance

Published on March 16, 2016
Duration: 18:41

This review covers the Auto-Ordnance M1A1 Thompson SBR, a semi-automatic reproduction of the iconic WWII firearm. It details historical context, design simplifications of the M1A1 variant, and practical performance including accuracy at 100 yards and reliability issues potentially linked to user technique. The video also includes a demonstration of field stripping and a brief look at a companion Auto-Ordnance 1911 replica.

Quick Summary

The Auto-Ordnance M1A1 Thompson SBR is a semi-automatic reproduction with a 10.5-inch barrel. Initial reliability issues were linked to 'limp shouldering'; firm grip and hotter ammo ensure 100% cycling. It shows surprising 100-yard accuracy for a .45 ACP carbine.

Chapters

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

Frequently Asked Questions

What are the key differences between the Auto-Ordnance M1A1 SBR and original military Thompsons?

The Auto-Ordnance M1A1 SBR is a semi-automatic, closed-bolt firearm, unlike the original military versions which were select-fire and operated from an open bolt. The M1A1 reproduction also features design simplifications like fixed sights and lacks features such as a vertical foregrip.

What caused the initial reliability issues with the Thompson M1A1 SBR?

Initial reliability issues, such as failures to feed, were likely caused by 'limp shouldering' due to the slippery metal buttplate. When the firearm was held more firmly, especially with hotter ammunition, it cycled 100% reliably.

How accurate is the Auto-Ordnance M1A1 Thompson SBR?

Despite its simple fixed sights and .45 ACP caliber, the M1A1 SBR demonstrated surprising accuracy during testing at 100 yards, performing well for a carbine of its type.

What are the specifications of the Auto-Ordnance M1A1 SBR?

The M1A1 SBR has a .45 ACP caliber, a 10.5-inch barrel, weighs 10.5 lbs, and typically accepts 20 or 30-round magazines. Its MSRP was listed around $1580 plus NFA tax.

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