The Colt M4CQB Replacement Barrel Assembly 10.3in brings factory-grade performance to your AR-15 build or short-barreled rifle project. This 10.3-inch chrome-lined barrel features a threaded muzzle and integrated front sight base, giving you a compact, duty-style configuration straight from Colt’s production line.

Ideal for range training, general-purpose shooting, and refining a compact AR platform, this barrel assembly offers dependable accuracy with its six-groove, 1:7 twist rifling and M4-style feed ramps. The carbine-length gas system is tuned for smooth cycling with standard 5.56 NATO ammunition, while the threaded 1/2x28 muzzle allows easy installation of compatible flash hiders or muzzle devices. Backed by Colt’s long-standing reputation for quality manufacturing, this barrel is a solid foundation for a reliable AR build.

Key Features:

• Manufacturer: Colt
• Model: M4CQB Replacement Barrel Assembly 10.3in
• Caliber: 5.56 mm NATO
• Barrel Length: 10.3 inches
• Twist Rate: 1:7
• Gas System Length: Carbine
• Muzzle Threads: 1/2x28
• Rifling: Six-Groove
• Feed Ramps: M4-Style
• Lining: Chrome