The Colt M4CQB Replacement Barrel Assembly (brand part no. SP64049) is a complete 10.3-inch barrel built to Colt’s close-quarters M4-CQB specification, dropping in for a factory-spec upgrade or repair. Colt is a proven name across military and law-enforcement carbine systems, and this replacement assembly gives builders and armorers a way to bring a rifle back to factory-correct configuration or build a dedicated close-quarters upper. The 1:7 twist rate stabilizes common 5.56 and .223 bullet weights for reliable performance in a compact-carbine configuration.
Key Specifications
- A 10.3-Inch Barrel Length suits close-quarters M4-CQB-style configurations.
- A 1:7 Twist Rate stabilizes common 5.56/.223 bullet weights.
- This Complete Replacement Barrel Assembly drops in for a factory-spec upgrade or repair.
- It’s Manufactured by Colt, a proven name in military and law-enforcement carbine systems.
Frequently Asked Questions
What barrel length does this assembly use? 10.3 inches.
Is this a complete, ready-to-install barrel assembly? Yes, it’s a complete replacement assembly built to factory-spec.
Buy the Colt M4CQB Replacement Barrel Assembly
Bring your build back to factory-correct configuration with this Colt replacement barrel assembly. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and add it to your rifle parts build.
