Commando

The Colt Commando is a compact carbine variant of the M16/AR-15 rifle family developed during the Vietnam War era to address the need for a very short, highly portable automatic weapon suitable for special operations forces, vehicle crews, helicopter crews, airborne troops, and others who needed effective firepower in an extremely compact package. Originally designated the XM177, the Commando featured a significantly shortened barrel—typically 10 or 11.5 inches—compared to the standard M16’s 20-inch barrel, combined with a telescoping stock that allowed the weapon to be collapsed to a remarkably short overall length.

The development of the Commando required engineering work to address the challenges inherent in shortening the AR-15’s direct-impingement gas system to such an extreme degree. A short barrel extracts gas much closer to the case head and generates a more violent, higher-pressure gas pulse that can cause reliability issues, accelerated wear, and increased muzzle blast. Colt’s engineers addressed this with a moderating device on the muzzle—variously described as a moderator, sound moderator, or flash hider—that provided some buffering of the gas pulse and reduced the prominent fireball that very short barrels tend to produce with high-powered cartridges.

The Commando was issued to U.S. Special Forces in Vietnam and saw extensive combat service, proving the concept of the compact automatic carbine that would eventually evolve into the M4 configuration that has become the standard U.S. military individual weapon. The civilian semi-automatic version of the Commando was produced by Colt for the commercial market and is collected as a historically significant piece of Cold War and Vietnam-era small arms development.

Original military-configuration XM177 variants are highly collectible, and the Commando’s place in the development of the modern military carbine makes it a piece of genuine historical importance in the evolution of American infantry weapons.