Product DescriptionThe FAXON FIREARMS Gov't/SOCOM Duty Series 10.5 inch 5.56 NATO barrel is built for compact AR-15 builds that demand durability and consistent performance. Manufactured in-house from certified 4150 CMV steel and finished inside and out with a black nitride treatment, this SOCOM-profile barrel is designed for long service life and corrosion resistance under hard use. It features button rifling with a 1:8 twist, a carbine-length gas system for reliable cycling, and an 11-degree target crown to help support repeatable accuracy. Each barrel is stress relieved, air-gauge tested, magnetic particle inspected, and individually headspace checked with precision hardened gauges.Product Highlights Duty Series SOCOM profile adds thermal mass for heat handling in short-barrel AR-15 and SBR-style builds Certified 4150 CMV steel with black nitride finish inside and out for wear and corrosion resistance Button-rifled 1:8 twist optimized for a wide range of common 5.56 NATO projectile weights Carbine-length gas system with .750 inch gas block journal for broad parts compatibility and dependable function 11-degree target crown plus in-house QC including air-gauge testing, magnetic particle inspection, and headspace checksSpecs Brand: FAXON FIREARMS Manufacturer Part Number: 15A58C10NSQ UPC: 816341020009 Caliber: 5.56 NATO Barrel Length: 10.5 inch Barrel Profile: SOCOM Material: 4150 CMV steel Rifling: Button rifled Twist Rate: 1:8 Finish: Black nitride (inside and out) Gas System: Carbine-length Gas Block Diameter: 0.750 inch Gas Block Journal Length: 1.9 inch Muzzle Thread: 1/2-28 TPI Barrel Extension: M4 Crown: 11-degree target crown Weight: 1.10 lb Inspection: Stress relieved, air-gauge tested, magnetic particle inspected, headspace checkedDisclaimer: 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 products manufacturer.