Colt SMG: First of the 9mm ARs

Published on August 8, 2025
Duration: 1:06

The Colt SMG, an early 9mm AR variant from the 1980s, was designed for law enforcement SWAT teams. It leveraged existing M16 controls to minimize training. Key features include a three-position selector, a gas deflector requiring a shortened dust cover, and a simple blowback, closed-bolt operation.

Quick Summary

The Colt SMG, developed in the 1980s, was an early 9mm AR variant designed for SWAT teams, leveraging M16 controls for easier training. It operates on a simple blowback, closed-bolt system and features a unique gas deflector requiring a shortened dust cover.

Chapters

  1. 00:00Introduction to the Colt SMG
  2. 00:14Design Philosophy & Training
  3. 00:27Controls & External Features
  4. 00:43Internal Mechanics: Blowback System

Frequently Asked Questions

What was the primary purpose behind the development of the Colt SMG?

The Colt SMG was developed in the 1980s to provide police SWAT teams with a 9mm submachine gun that utilized familiar controls and handling similar to their existing M16 rifles, thereby minimizing training requirements.

How does the Colt SMG operate mechanically?

The Colt SMG operates using a simple blowback mechanism with a closed-bolt system. This design was chosen for its reliability and simplicity in a pistol-caliber carbine.

What unique external features does the Colt SMG have?

It features a three-position selector (Safe, Semi, Auto) and a distinctive oversized plastic gas deflector. This deflector necessitated a modified, shortened dust cover compared to standard AR-15s.

What modifications were made to the AR-15 receiver for the Colt SMG?

The receiver was adapted to accept a 9mm magazine using a pinned-in adapter held by three roll pins. It also features a dedicated feed ramp and a forward-positioned ejector for reliable cycling.

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