Barrel 5.56Mm Nato 11.5'' 1-7 Black

The Colt 5.56 NATO 11.5" barrel with 1-7 twist is built for shooters who need a short, handy platform without sacrificing reliability. Whether you're assembling an AR pistol or short-barreled rifle (SBR), this heavy profile barrel delivers the velocity and accuracy potential you'd expect from Colt's ordnance-grade carbon steel construction. The chrome-lined bore and chamber provide corrosion resistance and extended service life, while the matte black Parkerized finish resists wear in the field.

This barrel comes pre-assembled with the extension, M4-type front handguard cap, and front sight tower/gas block already installed—a significant time-saver if you're building from a receiver and upper. The gas port is drilled for carbine-length gas tubing, a proven configuration that keeps even short-barreled guns running reliably. The 1/2"-28 TPI muzzle threads accept standard suppressors and muzzle devices, and the front sight tower includes a bayonet lug for traditional AR furniture.

Drop it into any mil-spec AR-15 upper receiver and you're ready to go. The 5.56 NATO chambering fires both military brass and civilian .223 Remington ammunition safely, giving you flexibility at the range or in the field. Note that a carbine-length gas tube is not included and must be sourced separately. As with any short-barreled rifle, all applicable NFA regulations apply.

Key Features

• 11.5" heavy profile barrel, 5.56 NATO / .223 Remington compatible
• Ordnance-grade carbon steel with chrome-lined bore and chamber
• 1-7 rifling twist for excellent stability across bullet weights
• Barrel extension pre-installed for immediate upper receiver fitment
• Front sight tower and gas block integrated; bayonet lug included
• Carbine-length gas port for reliable short-barreled operation
• 1/2"-28 TPI muzzle threads for suppressors and devices
• Matte black Parkerized finish for durability and corrosion resistance
• Mil-spec compatible with standard AR-15 upper receivers

Specifications

Frequently Asked Questions

Will this barrel fit my AR-15 upper receiver?

Yes, this Colt barrel is designed for any standard mil-spec AR-15, M16, or M4 upper receiver. The barrel extension is already installed, so fitment to a properly dimensioned receiver should be straightforward.

Can I use .223 Remington ammunition in this barrel?

Yes, the 5.56 NATO chamber is safe for both military 5.56 NATO and civilian .223 Remington ammunition.

What's included with this barrel?

The barrel comes fully assembled with the barrel extension, M4-type front handguard cap, and front sight tower/gas block pre-installed. A carbine-length gas tube is not included and must be purchased separately.

Is this barrel suitable for an AR pistol or SBR build?

Yes. The 11.5" length and carbine-length gas port are designed to work reliably in both AR pistol and short-barreled rifle configurations. Remember that SBR builds require NFA compliance.