T20 Family: Springfield Makes the Garand a Grenade Launching Sniper Machine Gun

Published on November 17, 2025
Duration: 28:24

This guide details the disassembly and feature overview of the Springfield T20 rifle series, based on expert analysis by Ian McCollum. It covers key modifications from the M1 Garand, including select-fire capabilities, magazine adaptations, and grenade launcher integration. The video emphasizes the historical context and technical evolution of these prototypes, highlighting their role as a bridge to future rifle designs.

Quick Summary

The Springfield T20 project aimed to modernize the M1 Garand by incorporating magazine feeding (20-round BAR magazines), select-fire capability, and scope mounting. Key modifications included a lengthened receiver to slow the bolt cycle and, in later variants, a roller bearing for improved reliability and a spigot for grenade launching.

Chapters

  1. 00:00Introduction to the T20 Project
  2. 01:20The BAR Magazine Challenge
  3. 03:03T20 Prototype Features
  4. 05:15Select-Fire Mechanism Demonstration
  5. 08:12Internal Comparison and Testing
  6. 11:18The T20E1 Evolution
  7. 14:13T20E1 Magazine and Bolt Hold-Open
  8. 17:03The T20E2 and Grenade Launching
  9. 20:06Project Termination and Legacy
  10. 23:33T20E2 Specific Mechanical Details

Frequently Asked Questions

What was the purpose of the T20 project?

The T20 project aimed to modernize the M1 Garand by creating a magazine-fed, select-fire rifle capable of mounting a scope, with plans for a paratrooper variant. It sought to integrate features from the BAR and improve upon the Garand's design for potential future military use.

How did the T20 address the challenge of using BAR magazines with the M1 Garand?

John Garand discovered that standard BAR magazines fed too quickly for the M1 Garand's cycle rate. To compensate, the T20 featured a receiver lengthened by 3/8 inch, which slowed down the bolt cycle to allow the magazine sufficient time to present the next cartridge.

What were the key differences between the T20, T20E1, and T20E2 variants?

The T20 was the initial prototype. The T20E1 added a roller bearing to the bolt lug and switched to closed-bolt operation for better accuracy. The T20E2 incorporated a spigot for mounting a rifle grenade launcher and a specialized gas vent plug.

Why was the T20 rifle series ultimately not adopted by the military?

Despite initial interest and an order for 100,000 rifles, the T20 project was canceled after Japan's surrender. Persistent issues with uncontrollable muzzle climb and overheating during full-auto fire led to its discontinuation, though it served as a vital technological precursor to the M14.

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