Product DescriptionThe CMMG 16.1" Lightweight Salt Bath Nitride (SBN) barrel is built for lightweight AR-15 upper builds while maintaining durability and reliability. Featuring a light taper profile and a corrosion-resistant salt bath nitride finish, this barrel includes a properly installed M4 barrel extension and is assembled with correct headspacing. A 1:7 twist rate and 5.56x45 NATO chamber support a wide range of common 5.56 loads, while the mid-length gas port helps balance cycling and recoil impulse.Product Highlights 16.1" lightweight, light taper profile ideal for custom lightweight AR-15 builds Salt Bath Nitride finish for enhanced wear resistance and corrosion protection 1:7 twist with a 5.56x45 NATO chamber for versatile 5.56 NATO performance Mid-length gas port for balanced operation and smoother cycling characteristics Threaded 1/2-28 muzzle with a .625" gas journal for common AR-15 compatibilitySpecs Brand: CMMG Manufacturer Part Number: CMM55D470B UPC: 815835018102 Platform: AR-15 Caliber/Chamber: 5.56x45 NATO Barrel Length: 16.1 in Profile: Light Taper Material: 4140CM Finish: Salt Bath Nitride Twist Rate: 1:7 Muzzle Threads: 1/2-28 Gas System Length: Mid-length (mid length gas port) Gas Journal: 0.625 in Extension: M4 barrel extension (installed) Assembly Note: Properly headspaced barrel sub-assemblyDisclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.