Colt AR-15 Upper Receiver Assembly 5.56x45mm, 16" Barrel, No Handguard

A Colt AR-15 upper receiver assembly in 5.56x45mm NATO gives you the freedom to build exactly what you want without paying for handguards you'll never use. This 16-inch barreled upper arrives as a complete, ready-to-function group—bolt carrier group and charging handle included—so you can mate it to your lower and start shooting, or swap in your choice of aftermarket handguard for a truly custom build. Whether you're refreshing a rifle, assembling a precision setup, or just want a no-compromise upper without the factory plastic, this Colt assembly delivers the quality and versatility AR builders expect.

The 16-inch barrel is threaded 1/2"-28 TPI, fitting standard suppressors and muzzle devices, and its 1:7 twist rate runs heavy 5.56 loads reliably across a wide velocity range. Button-rifled construction ensures consistent accuracy. A low-profile gas block sits flush enough to clear most free-float handguards on the market, so if you're planning a lightweight tactical rail or magnesium quad setup, this upper won't force you into compromises.

Colt's reputation for tight tolerances and quality control means you're getting a proven platform that works with any AR-15 lower receiver. No handguard means no waste—just a solid, versatile upper that begs for the furniture and finish you want to run.

Key Features

• Complete upper receiver assembly ready to function out of the box
• Includes bolt carrier group and charging handle
• 16-inch button-rifled barrel for reliable accuracy
• 1/2"-28 TPI threaded muzzle for suppressors and muzzle devices
• 1:7 twist rate suitable for standard to heavy 5.56 ammunition
• Low-profile gas block compatible with free-float handguards
• Handguard-free design lets you choose your own rail or furniture

Specifications

Frequently Asked Questions

Will this upper work with any AR-15 lower receiver?

Yes. This is a standard Colt AR-15 upper receiver assembly that accepts any mil-spec AR-15 lower receiver.

What handguards are compatible with this upper?

The low-profile gas block is designed to clear most free-float handguards on the market. Since no handguard is included, you can choose any aftermarket rail or furniture that fits standard AR-15 uppers. Verify gas block clearance with your specific handguard manufacturer if needed.

What comes in the box?

The upper receiver assembly, bolt carrier group, and charging handle are included. No handguard is provided.

Is this upper suitable for hunting or long-range shooting?

The 16-inch barrel and 1:7 twist rate support a wide range of 5.56 ammunition, making this upper versatile for hunting, target shooting, and tactical applications. Your accuracy will depend on your chosen handguard, optics, and ammunition.