Colt M4A1 Carbine: NSN 1005-01-382-0953
The Enduring Legacy of the Colt M4A1 Carbine
Few modern rifles have had the long operational lifespan or global reach of the Colt M4A1. Introduced as a compact evolution of the M16 family, the M4A1 has become one of the most recognizable military carbines in the world.
Decades after its introduction, the platform continues to hold a place not only in military service but also in Colt’s current product lineup—an indication of how durable the design has proven to be.
Colt’s history as a firearms manufacturer stretches back nearly two centuries, and the company has produced millions of service rifles for military customers around the world.
Within that legacy, the M4A1 stands out as a defining modern product. Officially designated with National Stock Number (NSN) 1005-01-382-0953, the Colt M4A1 Carbine has served as the standard-issue rifle for all branches of the United States Armed Forces.
Beyond the U.S., the rifle has also been widely adopted by NATO member states and more than 100 additional countries, as well as numerous law enforcement agencies. Production numbers reflect that broad use. Colt has delivered more than 10 million M16-series service rifles throughout its history.
Since 2001 alone, more than one million Colt M4A1 carbines and variants have been supplied to the U.S. military, with an additional 640,000 M4-pattern carbines delivered to domestic and international military and law-enforcement customers. Thousands more remain in the production pipeline.
Part of the M4A1’s staying power comes from the rigorous standards under which it is produced. Colt manufactures the rifle according to MIL-DTL-71186, the military specification governing official production.
This specification incorporates Colt’s Technical Data Package (TDP), which details the materials, dimensions, inspection procedures, and testing requirements necessary to meet military standards. The document outlines more than 200 criteria covering tolerances, endurance testing, targeting accuracy, and parts interchangeability.
Although many companies now produce rifles that resemble the M4A1, Colt remains the owner of the original TDP. That data package defines what constitutes a true M4A1 built to U.S. military specifications. While other manufacturers may produce AR-pattern carbines with similar external features, they are not produced using Colt’s technical data and therefore do not meet the same official specification.
This distinction carries practical implications in the international market. Colt is the only U.S. manufacturer authorized to supply authentic TDP-built M4A1 carbines through the U.S. Army’s Foreign Military Sales (FMS) program.
That authorization stems from a licensing agreement between Colt and the U.S. Army that has been in place since 1967. For allied nations purchasing rifles through the FMS system, the arrangement ensures they receive units made to the same specifications as rifles issued to American forces.
Today, even as new service rifles enter development and military programs evolve, the M4A1 continues to appear in Colt’s catalog. Its longevity reflects a design that has proven adaptable across decades of operational use. For Colt, it represents both a cornerstone of the company’s modern lineup and a continuation of a legacy built on supplying service arms to military users around the world.
Colt
M4A1 Carbine
colt.com
