Colt Model 639: MACVSOG's Vietnam Carbine

Published on October 24, 2018
Duration: 8:47

The Colt Model 639 is an export variant of the XM177E2, notable for its use by MACVSOG during the Vietnam War. It features an 11.5-inch barrel and a unique muzzle moderator designed to alter its sound signature. Due to ATF regulations classifying these moderators as suppressors, many were recalled, making the Model 639 exceptionally rare.

Quick Summary

The Colt Model 639 is a rare export variant of the XM177E2 carbine, famously used by MACVSOG in Vietnam. It features an 11.5-inch barrel and a unique muzzle moderator designed to mimic an AK-47's sound. Its rarity stems from low production and ATF regulations classifying moderators as suppressors.

Chapters

  1. 00:00Introduction to the Colt Model 639
  2. 01:20Development and Barrel Length
  3. 02:50External Features and Receiver
  4. 04:15Markings and Selector
  5. 05:52Internal Components and Rarity

Frequently Asked Questions

What is the Colt Model 639 and why is it significant?

The Colt Model 639 is an export variant of the Colt Model 629, which the US military designated as the XM177E2. It's historically significant for its use by MACVSOG during the Vietnam War, particularly its unique muzzle moderator.

What was the purpose of the muzzle moderator on the Colt Model 639?

The muzzle moderator on the Colt Model 639 was designed to alter the rifle's sound signature, making it resemble the noise of an AK-47. This was intended to confuse enemy forces and aid special operations teams operating behind enemy lines.

Why are Colt Model 639 rifles considered rare?

Colt Model 639 rifles are rare due to low production numbers (around 102 units) and subsequent recalls. The ATF classified their muzzle moderators as suppressors in 1975, requiring NFA registration, which led many owners to have them removed or the rifles recalled by Colt.

What are the key external features of the Colt Model 639?

The Colt Model 639 features a 'full fence' receiver to prevent accidental magazine release, a two-position collapsible aluminum stock, a teardrop forward assist, and early pattern sights. Its barrel is 11.5 inches long.

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