Colt AR-15 5.56x45mm Upper Receiver Assembly with 16" Barrel & Centurion CMR 13" M-LOK Handguard

The Colt AR-15 5.56x45mm upper receiver assembly with 16" barrel and Centurion CMR 13" M-LOK handguard gives you a ready-to-run upper that drops straight onto your AR-15 lower receiver. Built on Colt's Enhanced Patrol Rifle platform, this upper ships as a complete assembly designed for shooters who want a practical, no-fuss setup without piecing together individual components. The 16" barrel length strikes the balance most hunters and range shooters want—fast handling without sacrificing velocity—while the free-floating Centurion handguard keeps your barrel unencumbered for consistency shot to shot.

The barrel itself is chrome lined and button rifled with a 1-7 twist rate, giving you the rigidity and longevity Colt barrels are known for. A phosphate finish protects against corrosion during field use and training. This upper arrives complete with an M16 bolt carrier group and charging handle, so you're not hunting down parts before you can function-test it. If you're dropping this onto an existing lower, you're ready to go to the range or field.

The Centurion CMR handguard brings modern ergonomics to the platform. Its 13" length provides plenty of real estate for optics, lights, or other tactical accessories via M-LOK slots, while keeping the overall package reasonably compact. Whether you're building a hunting rifle, a practical duty setup, or upgrading an existing build, this Colt upper delivers the kind of straightforward reliability and functionality that has made the AR-15 the most versatile rifle platform in America.

Key Features

• 16" chrome-lined, button-rifled barrel with 1-7 twist rate
• Phosphate finish protects against corrosion
• Free-floating Centurion CMR 13" M-LOK handguard for consistency and accessory mounting
• Includes M16 bolt carrier group and charging handle—ready to run out of the box
• Designed to pin to a standard AR-15 lower receiver

Specifications

Frequently Asked Questions

Will this upper fit my AR-15 lower receiver?

Yes. This Colt upper assembly is designed to pin to any standard AR-15 lower receiver. Make sure your lower is in compliance with local and federal law before assembly.

What comes in the box?

This is a complete upper receiver assembly that includes the barrel, bolt carrier group, and charging handle. You only need to supply the lower receiver and any furniture or accessories you prefer.

Is the handguard M-LOK or Picatinny?

The Centurion CMR handguard uses M-LOK slots for mounting accessories like lights, vertical grips, or slings. It's a free-floating design, meaning it doesn't contact the barrel, which helps maintain accuracy.

What's the barrel length good for?

The 16" barrel is a versatile length for hunting, training, and field use. It offers a balance between velocity and handling, and it keeps your overall rifle package manageable in the field or at the range.