The Colt M4/M4A1 Replacement Barrel Assembly 14.5in gives AR-15 builders and owners a genuine mil-spec foundation for an M4A1-style carbine. This complete assembly includes the barrel, extension, barrel nut, and fixed front sight tower with sling swivel, all tuned around a carbine-length gas system and a 14.5-inch, chrome-lined steel barrel chambered in 5.56 NATO.

Designed to mirror the performance of contract M4A1 carbines, this barrel uses six-groove rifling with a 1:7 twist to stabilize a wide range of bullet weights, from standard service loads to heavier match ammunition. M4-style feed ramps support reliable cycling, while the 1/2"-28 threaded muzzle is ready for your preferred flash hider, brake, or suppressor-compatible device. Whether you are refreshing a hard-used carbine or completing a new build, this Colt assembly offers straightforward installation and dependable performance backed by Colt’s long-standing reputation for quality AR-15 components.

Key Features:

• Manufacturer: Colt
• Model: M4/M4A1 Replacement Barrel Assembly 14.5in
• Caliber: 5.56x45 NATO
• Barrel Length: 14.5 Inches
• Twist Rate: 1:7 Inch
• Gas System Length: Carbine
• Muzzle Threads: 1/2"-28 TPI
• Feed Ramps: M4-Style
• Bore Lining: Chrome-Lined Steel
• Included Components: Barrel, Extension, Barrel Nut, Front Sight Tower, Post, Sling Swivel