The CMMG 5.56 NATO Barrel Sub-Assembly is designed for building custom AR-15 upper groups with confidence. This barrel comes with a properly installed barrel extension, ensuring correct headspacing and saving valuable build time.
Featuring a salt bath nitride finish inside and out, this barrel delivers excellent durability, corrosion resistance, and extended barrel life. The medium taper profile offers an ideal combination of weight savings and barrel rigidity. Backed by CMMG Lifetime Quality Guarantee.
Key Features:
- Manufacturer: CMMG
- Caliber: 5.56 NATO/.223 Remington
- Finish: Salt Bath Nitride
- Profile: Medium Taper
- Platform: AR-15
- Includes: Properly installed barrel extension
- Lifetime Quality Guarantee








