Colt Le6933 Replacement Barrel Assembly 11.5In

The Colt LE6933 Replacement Barrel Assembly 11.5In is a factory OEM barrel solution for AR-15 owners and builders looking to restore or upgrade their rifle with genuine Colt components. Whether your current barrel has logged years of rounds downrange or you're assembling a new build and want the proven profile of Colt's iconic LE6933 platform, this 11.5-inch barrel assembly delivers the reliability and fit that AR shooters depend on. Colt now offers these barrels as complete assemblies, stripping the guesswork out of sourcing matched components for your carbine.

This barrel assembly is chambered in 5.56 NATO and built with a 1:7-inch twist rate, making it responsive across a wide range of bullet weights—from lightweight varmint rounds to heavier tactical loads. The six-groove rifling is paired with M4-style feed ramps for reliable feeding and a chrome-lined bore that resists corrosion and extends barrel life through high round counts. The carbine-length gas system tuning ensures consistent cycling whether you're running suppressed, unsuppressed, or with various uppers and handguard configurations. The muzzle is threaded 1/2"-28 TPI, standard for modern AR accessories and suppressors.

As an assembly, this barrel comes complete with the barrel nut, front-sight tower, post, and sling swivel already fitted—no secondary fitting or headspacing concerns. It's the fastest path to a working upper receiver if you're replacing a worn or damaged barrel or finishing a build with minimal hassle.

Key Features

• Genuine Colt OEM barrel assembly for LE6933 AR-15 platform
• 11.5-inch barrel length with carbine-gas system tuning
• 5.56 NATO chamber with 1:7-inch twist rate
• Six-groove rifling with M4-style feed ramps
• Chrome-lined bore for corrosion resistance and durability
• Includes barrel nut, front-sight tower, post, and sling swivel
• 1/2"-28 TPI muzzle threading for standard AR accessories

Specifications

Frequently Asked Questions

Is this barrel assembly compatible with my AR-15 upper receiver?

This is a complete barrel assembly designed for the Colt LE6933 platform. It includes the barrel extension and is fitted with barrel nut, front-sight tower, and post, so it's ready to install into a compatible upper receiver.

What caliber is this barrel?

This barrel is chambered in 5.56 NATO with a 1:7-inch twist rate, suitable for standard rifle rounds and a wide range of bullet weights.

Does this assembly come with everything I need to build a complete upper?

This assembly includes the barrel, barrel extension, barrel nut, front-sight tower, post, and sling swivel. It does not include the upper receiver itself or bolt carrier group—those are sourced separately.

What is the muzzle thread size?

The muzzle is threaded 1/2"-28 TPI, the standard thread pitch for AR-15 muzzle devices, including flash hiders, compensators, and suppressors.