Colt Model 639: MACVSOG's Vietnam Carbine

Published on October 24, 2018
Duration: 8:47

This video provides an expert-level review of the Colt Model 639, a select-fire carbine used by MACVSOG during the Vietnam War. Ian McCollum, a recognized firearms historian, details its development, unique features like the moderator, and historical significance. The entry highlights the rifle's rarity and regulatory considerations due to its NFA-classified muzzle device.

Quick Summary

The Colt Model 639 is a rare, select-fire carbine used by MACVSOG in Vietnam, notable for its 11.5-inch barrel improving reliability and its NFA-classified moderator designed to mimic an AK-47 sound signature. Only about 102 were sold, with many recalled due to ATF suppressor regulations.

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 its historical significance?

The Colt Model 639 is a select-fire carbine, an export version of the Colt 629 (US military XM177E2), famously used by MACVSOG during the Vietnam War. Its historical significance stems from its role in special operations during that era.

Why was the barrel length of the Colt Model 639 increased?

The Colt Model 639 features an 11.5-inch barrel, an increase from the earlier 10-inch barrel of the Colt 609. This modification was implemented to improve the reliability of the direct impingement gas system, which struggled with shorter barrels.

What is the function of the moderator on the Colt Model 639?

The moderator on the Colt Model 639 is an NFA-classified suppressor. Its primary function was to alter the firearm's sound signature, making it sound similar to an AK-47, which aided special forces operating covertly behind enemy lines.

How rare is the Colt Model 639?

The Colt Model 639 is exceptionally rare, with only around 102 units ever sold. Many were recalled by Colt due to ATF regulations classifying the moderators as suppressors, further increasing their scarcity.

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