Colt's M4A1 And Why It's So Important

posted on June 9, 2011
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
ii2015_fs.jpg

Picking up where we left off with the Insider’s trip to Hartford, Conn., to visit Colt, we come to the storied company’s most distinguishing product. It’s not the legendary Single Action Army nor the venerable Government Model—those are so last century. It’s the M4A1, the U.S. military’s official issue-rifle.

A quick point of order—remember that there are two Colts, Colt’s Mfg. Co., which manufacturers and markets commercial guns and Colt Defense LLC which manufacturers military and law enforcement weapons. When I speak of “Colt” I use the name as a collective noun for both entities even though they’re legally and financially independent.

Coltis currently the only supplier of M4A1 rifles to the U.S. military. Belgian-owned Fabrique Nationale has in the past been a military supplier, and still makes the M249, M2 and other systems for the military, but as of right now, they’re not under contract to make the M4A1.

What makes Colt’s M4A1 so remarkable is the night-and-day difference between how this gun is manufactured compared to every other Colt firearm. You have to see it to appreciate it. The area where the M4A1 is produced is physically and metaphorically removed from the rest of the factory. It’s “lean” manufacturing, just-in-time parts, kanban cards, ISO quality assurance, CNC machines, conveyor belts, work cells and every other facet of Toyota-esque manufacturing—which is to say, the most sophisticated and efficient—this side of Dell Inc.

And then there’s Greg Frost. Without Greg, there would be no M4A1 for he is the Resident Quality Assurance Specialist, a civilian employee of the Dept. of Defense. He’s the government’s watchdog charged with inspecting Colt’s production of the M4A1 to assure that the weapons meet all Military Specifications as defined by Military Standards (Mil-Std).

“I monitor everything from soup to nuts in [the weapon’s] production, testing all the way down to the most mundane details,” Frost said.

Mundane details? “Like what?” I ask.

“The shipping box, for example. Even the tape on the box,” the inspector replied.

“In a process fashion, we inspect, test and analyze data on behalf of the Department of Defense. We have a Zero-Based Acceptance Policy—we do not accept a batch if there’s even one failure,” Frost explained.

I’m fascinated. So much marketing malarkey has been bandied about by all the knock-off AR manufacturers about being Mil-Spec this and Mil-Spec that. I ask Frost his opinion.

“I work for the Defense Contract Management Agency, which is part of the Department of Defense. Our Contract Management office is nearby in East Hartford. Because of the military contract and the inspections required, Colt has become one of the highest ISO 2008 suppliers, meeting all quality standards.”

“Well, who exactly are the manufacturers of Mil-Spec M4s?” I ask.

“FN and Colt and Sabre. However, Sabre didn’t keep up with the requirements and were dropped. Right now only Colt has a contract,” Frost answered.

Last year I wrote in a story for AmericanRifleman.org that if you’re looking to buy a quality AR, don’t mess about, just buy a Colt 6920. Now I better appreciate exactly why Colt makes the best AR on the market—his name is Greg Frost.

Latest

Kimber 2K11 Comp F
Kimber 2K11 Comp F

New For 2026: Kimber 2K11 Comp

Kimber increased its 2K11 product line with the addition of two models with single-port compensators.

AR-15 vs. Bullpup Rifles: Which One Is Right For You?

Though bullpup-style rifle designs have become popular elsewhere in the world, they aren't nearly as popular with the American shooting public as the ubiquitous AR-15.

2025 Year-End Gun Sales Dip Ahead Of $0 NFA Tax Stamp Enactment

Firearm sales were down in December 2025, reflecting a pause that may be attributable to enthusiasts waiting for the official start of the $0 NFA tax stamp that became official in January 2026.

Preview: Muddy DV8 Enduro Jacket

The softshell component in Muddy’s all-season DV8 camouflage layering system, the Enduro Jacket is designed for warmth, water-resistance and ruggedness while also emphasizing silent mobility.

Review: Savage 110 Trail Blazer Rifle in 22 Creedmoor

Savage’s new 110 Trail Blazer rifle offers top-shelf performance at entry-level pricing.

I Carry: Springfield Armory Hellcat Pro 9 mm Pistol in a PHLster Holster

In this week's episode of "I Carry," we have a Springfield Armory Hellcat Pro 9 mm pistol with a Meprolight MPO Pro-S red-dot sight carried in a PHLster Skeleton kydex holster.

Interests



Get the best of American Rifleman delivered to your inbox.