The Colt M4CQB Replacement Barrel Assembly is a premium 10.3-inch barrel designed for the AR-15 platform engineered to enhance performance and reliability. Chambered for the versatile 5.56 mm NATO cartridge this barrel features a robust black finish that offers durability and corrosion resistance. Its carbine-length gas system ensures optimal cycling and efficiency making it ideal for tactical applications. With a precise 1-7 twist rate this barrel provides exceptional accuracy and stability for a wide range of ammunition types. The 1/2-28 muzzle threads allow for easy installation of various muzzle devices making it a versatile choice for any AR-15 enthusiast looking to upgrade their firearm.