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Thompson SMG gun parts kit

Thompson Original USGI – Cal. .45 – M1 Parts Kit


  • Manufacturer: Auto-Ordnance Company, Bridgeport, Connecticut
  • Cartridge: .45 ACP
  • Action: Friction-delayed blowback
  • Feed system: Stick magazine
  • Effective firing range: 164 yds. (150m)
  • Condition: Good

Kit Includes:

  • Complete lower frame assembly with buttstock/buttplate
  • Demilled upper receiver (cut to BATF specs)
  • Bolt assembly
  • Horizontal foregrip with sling swivel
  • Front blade sight ring with cut barrel piece
  • Ejector
  • Buffer pad
  • Buffer pilot and recoil spring
  • Bolt handle

Original price was: $2,100.99.Current price is: $1,750.99.


Thompson SMG gun parts kit | Thompson SMG gun parts kit For Sale

The Thompson submachine gun, affectionately known as the “Tommy Gun,” is one of the most iconic firearms in history. Renowned for its distinctive design, rapid rate of fire, and historical significance, the Thompson SMG has left an indelible mark on military history and popular culture. For collectors and firearm enthusiasts, acquiring a Thompson SMG parts kit with the Blish Lock included is a unique opportunity to own a piece of this storied firearm’s legacy. In this blog post, we will explore the components of a Thompson SMG parts kit, focusing on the Blish Lock, and understand why this firearm remains so revered.

The History of the Thompson SMG

General John T. Thompson developed the Thompson submachine gun in the early 20th century. It saw extensive use during World War II and the Prohibition era. Its high rate of fire, reliability, and .45 ACP stopping power made it a favorite among soldiers, law enforcement officers, and even gangsters.

Components of a Thompson SMG Parts Kit

A Thompson SMG parts kit typically includes various components necessary to assemble or maintain this classic firearm. Essential parts often included are:

  1. Receiver: The central part of the firearm, housing the firing mechanism and other essential components.
  2. Barrel: The .45 ACP barrel is known for its accuracy and durability.
  3. Bolt Assembly: Includes the bolt, firing pin, and extractor, crucial for the firearm’s operation.
  4. Trigger Group: Contains the trigger, sear, and associated springs and pins.
  5. Stock and Grip: The wooden or polymer stock and grip provide the shooter stability and control.
  6. Magazine: A stick or drum magazine typically holds .45 ACP rounds.
  7. Blish Lock: A unique feature of the Thompson SMG, which we’ll explore further.

The Blish Lock: A Unique Mechanism

The Blish Lock, named after John Bell Blish, is a distinctive feature of the Thompson submachine gun. This mechanism was based on Blish’s observation that certain metals tend to adhere under high pressure, a phenomenon he termed the “Blish Principle.” Here’s how it works and why it’s significant:

  1. Operation: The Blish Lock consists of a bronze block fitted into cuts in the receiver and the bolt. When the firearm is fired, the pressure from the expanding gases locks the bolt in place momentarily, delaying the blowback action.
  2. Advantages: This delay allows for the controlled release of gases, reducing wear on the firearm and improving accuracy. It also enables the Thompson SMG to handle the powerful .45 ACP cartridge more effectively.
  3. Historical Significance: Although later models of the Thompson SMG moved away from the Blish Lock, its inclusion in early models is a testament to the innovative engineering behind this iconic firearm.

Collecting and Assembling a Thompson SMG Parts Kit

For collectors and enthusiasts, a Thompson SMG parts kit with the Blish Lock is a treasure trove. Assembling or restoring a Thompson from a parts kit is a rewarding project and a way to preserve a piece of firearm history. Here are some considerations:

  1. Legal Compliance: When assembling or owning a parts kit, it’s crucial to ensure compliance with all local, state, and federal laws. Certain parts or modifications may require specific licenses or registrations.
  2. Technical Expertise: Assembling a Thompson SMG from a parts kit requires a certain level of technical expertise and understanding of firearm mechanics. Manuals and guides can be invaluable resources.
  3. Historical Preservation: Maintaining the authenticity and condition of original parts is important for preserving the firearm’s historical value.


The Thompson SMG parts kit, complete with the Blish Lock, offers a fascinating glimpse into the history and engineering of one of the most legendary firearms ever made. Whether you are a collector, historian, or firearm enthusiast, owning and working with a Thompson parts kit is a journey into the past, allowing you to connect with the legacy of the Tommy Gun. As you assemble and preserve this remarkable piece of history, you honor its legacy and ensure that the story of the Thompson SMG continues to be told for generations to come.


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