This CMMG Barrel Sub-Assembly is built for use in AR-15 upper assemblies and comes with a factory-installed M4 barrel extension for drop-in compatibility with standard uppers. It is specified for .223 Rem / 5.56 NATO and is supplied in a carbine-length configuration with an M4 profile. The barrel is finished with a black nitride treatment and constructed from 4140 chromoly steel as specified in the product name.
Key Specifications
- Model: Barrel Sub-Assembly.
- Caliber: .223 Rem / 5.56 NATO.
- Barrel length: 16.10 inches.
- Finish: Nitride (black).
- Material: 4140 Chromoly Steel.
- Barrel profile: M4 Profile.
- Barrel type: Carbine Length.
- Rate of twist: 1:7″.
- Includes: Properly installed M4 barrel extension for AR-15 upper compatibility.
- Product type: Rifle.
Designed for builders and technicians assembling AR-15 uppers, this CMMG sub-assembly offers a service-profile barrel with durable materials and a protective nitride finish. Its M4 extension and standard profile make it straightforward to integrate into a range of AR-15 upper configurations, while the 1:7″ twist provides stabilization for commonly used 5.56 projectiles. The combination of 4140 chromoly steel and nitride treatment gives a balance of strength and corrosion resistance for routine range and field use.
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