Product DescriptionUpgrade your next build with the Rosco Manufacturing Bloodline 16" M4-profile 5.56 NATO barrel, engineered to deliver balanced performance for modern carbine setups. Built from durable 4150 CMV steel and finished in nitride for enhanced wear and corrosion resistance, this barrel features properly sized gas ports to help optimize function and reduce premature wear commonly associated with over-gassed systems. A 1:7 twist rate supports a wide range of 5.56 NATO projectiles, while the carbine-length gas system and 1/2x28 muzzle threads make it a versatile fit for many AR-pattern configurations.Product Highlights 16-inch Bloodline-series 5.56 NATO barrel designed for modern carbine performance and balance 4150 CMV barrel steel for strength and longevity in demanding use Nitride finish improves corrosion resistance and overall durability 1:7 twist rate suited for many common 5.56 NATO bullet weights M4 profile with carbine-length gas system and 1/2x28 muzzle threads for broad compatibility Specs Brand: Rosco Manufacturing Series/Model: Bloodline Barrel Length: 16 in Caliber: 5.56 NATO Profile: M4 Twist Rate: 1:7 Gas System Length: Carbine Muzzle Thread Pitch: 1/2x28 Material: 4150 CMV Finish: Nitride Manufacturer Part Number: BL-16-M4-556-7-C UPC: 181969500067 Disclaimer: 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.