M15 Automatic Rifle (aka T44E5): Adopted But Not Produced

Published on March 23, 2026
Duration: 14:12

This video provides an expert-level review of the M15 (T44E5) rifle, an American military prototype developed from the T44 program that eventually led to the M14. Ian McCollum of Forgotten Weapons details its design, intended role as a light machine gun to replace several existing firearms, and the reasons it was adopted but never mass-produced. The review highlights its heavy barrel, bipod, and select-fire capability, contrasting it with the standard M14 and discussing the challenges faced during testing at Aberdeen Proving Grounds.

Quick Summary

The M15 rifle (T44E5) was an American prototype light machine gun developed from the T44 program. Adopted but never mass-produced, it featured a heavy barrel, bipod, select-fire capability, and was chambered in 7.62x51mm NATO. It aimed to replace several older automatic weapons but was ultimately declared obsolete in 1959.

Chapters

  1. 00:00Introduction to M15 Rifle
  2. 00:24M14 Context and M15's Role
  3. 01:23Early T44 Development & Variants
  4. 02:52T44E1 Testing and Flaws
  5. 03:43T44E1 Problems & Receiver Evolution
  6. 05:18T44E4/E5 Adoption and Features
  7. 06:25M15 Features: Bipod and Markings
  8. 08:00M15 Features: Full Auto & Stock
  9. 09:37M15 Features: Magazine, Trigger & Stock/Barrel Comparison
  10. 11:21Why M15 was Not Produced
  11. 12:53M14E2 and Springfield Armory

Frequently Asked Questions

What was the M15 rifle and why was it significant?

The M15 rifle, also known as the T44E5, was an American prototype light machine gun developed from the T44 program. It was adopted by the military but never mass-produced, making it a significant example of a firearm that reached official acceptance without entering widespread service.

What were the key features of the M15 (T44E5) rifle?

The M15 featured a heavy barrel, a bipod for stability, a select-fire capability, a flash hider, and a reinforced stock. It was chambered in 7.62x51mm NATO and designed for sustained fire roles, aiming to replace several older automatic weapons.

Why was the M15 rifle never mass-produced?

Despite its adoption, the M15 was not mass-produced due to several factors, including the success of the M14 as a standard rifle, the M2 bipod proving adequate for the M14, and the M15's heavier features not offering enough advantage to justify separate production lines. It was declared obsolete in 1959.

What role was the M15 intended to fill?

The M15 was designed as a heavy-barreled light machine gun variant of the T44 (which became the M14). Its intended role was to replace multiple existing firearms like the M3 Grease Gun, M1 Garand, 1919A6, and BAR, providing a more modern and versatile automatic weapon.

Related News

All News →

More Reviews Videos You Might Like

More from Forgotten Weapons

View all →