Stemple 76/45 + Russian Lend-Lease Thompson Kit = STG-M1A

Published on November 25, 2025
Duration: 1:03

This guide details the disassembly of the STG-M1A, a firearm legally classified as a Stemple 76/45 but visually resembling a Thompson submachine gun. Expert Ian McCollum demonstrates how the Stemple receiver tube, the serialized part, is housed within a Thompson-style dummy receiver, allowing for a Thompson-like experience while adhering to NFA regulations. The process involves separating the upper receiver housing to access the internal Stemple tube.

Quick Summary

The STG-M1A is legally classified as a Stemple 76/45, utilizing an unmodified Stemple receiver tube housed within a Thompson-style dummy receiver. This construction offers the aesthetic and ergonomics of a Thompson submachine gun at a lower cost than a transferable Colt Thompson, while also preserving original parts from wear.

Chapters

  1. 00:00Introduction to STG-M1A
  2. 00:12Mechanical Design and Construction
  3. 00:34Disassembly and Components
  4. 00:46Benefits and Value Proposition

Frequently Asked Questions

What is the STG-M1A legally classified as?

The STG-M1A is legally classified as a Stemple 76/45. Despite its visual resemblance to a Thompson submachine gun, its legal identity is determined by the unmodified Stemple receiver tube, which is the serialized component.

How is the STG-M1A constructed?

The STG-M1A features an unmodified Stemple 76/45 round receiver tube housed within a square dummy receiver box designed to replicate the look and feel of a Thompson submachine gun. It uses a standard Thompson lower receiver.

What are the benefits of the STG-M1A compared to an original Thompson?

The STG-M1A provides the shootability and ergonomics of a Thompson at a lower investment cost than a transferable Colt Thompson. It also avoids wear and tear on rare original Thompson parts, as the Stemple tube has minimal wear points and uses replaceable components.

Who is Ian McCollum and why is his assessment authoritative?

Ian McCollum is the host of Forgotten Weapons, a channel recognized for its in-depth historical and technical analysis of firearms. His expertise is evident in his detailed knowledge of NFA classifications, submachine gun mechanics, and historical firearms context.

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