XM-148: Colt's Vietnam Grenade Launcher

Published on December 11, 2019
Duration: 9:00

The Colt XM-148 was the US military's first under-barrel grenade launcher, developed from the SPIW program for the M16 rifle. Despite its innovative design, it suffered from significant flaws, including a snagging trigger bar, high cocking force, and mechanical complexity. These issues led to its replacement by the simpler and more reliable M203, making the XM-148 a notable but ultimately unsuccessful footnote in firearms history.

Quick Summary

The Colt XM-148 was the US military's first under-barrel grenade launcher for the M16, developed from the SPIW program. Despite its role in increasing infantry firepower, it suffered from a snagging trigger bar, high cocking force, and complexity, leading to its replacement by the M203.

Chapters

  1. 00:00Introduction: Colt XM-148 & Project SPIW
  2. 01:25Development: Colt vs. Ford vs. AAI
  3. 02:33Production & Vietnam Deployment
  4. 03:43Loading and Operation Mechanism
  5. 04:33Cocking Handle & Trigger Bar Issues
  6. 05:59Quadrant Sights & Handguard
  7. 07:14Why the XM-148 Failed: Legacy

Frequently Asked Questions

What was the Colt XM-148?

The Colt XM-148 was the first US military under-barrel grenade launcher, designed for the M16 rifle. It originated from the SPIW program and saw limited use in Vietnam before being replaced by the M203.

Why was the XM-148 grenade launcher developed?

It was developed as part of the Special Purpose Infantry Weapon (SPIW) program to increase infantry's area-effect capability by adding a grenade launcher to the standard M16 rifle.

What were the main problems with the XM-148?

Key issues included its trigger bar snagging on brush, requiring excessive cocking force (30 lbs), and overall mechanical complexity making field repairs difficult. These led to its eventual replacement.

How did the XM-148 load?

To load the XM-148, a button was pressed, allowing the barrel to slide forward. A 40mm grenade was inserted, and the barrel was then slid back and locked into place.

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