The Faxon Firearms DUTY 308 WIN 13.9'' BBL MID-LENGTH BIG GUNNER NITRIDE is engineered for AR-15 platforms seeking precision and reliability in a compact, mid-length gas system, featuring a 13.9-inch Big Gunner contour barrel with a 1-10 twist, 5/8-24 muzzle threads, and a durable nitride finish that enhances corrosion resistance and longevity under demanding field conditions. Crafted for 308 Winchester performance, this barrel integrates seamlessly with AR-15 receivers, delivering clean bore alignment and repeatable accuracy across varied ammunition while maintaining a sleek Black appearance. Its mid-length gas system optimizes recoil impulse for smoother follow-up shots, making it an excellent choice for precision sport, hunting, or duty-ready setups where consistent velocity and reliability matter. The 1.8-pound weight ensures a balanced feel without sacrificing rigidity or heat management, and the combination of the Big Gunner contour and high-quality machining supports repeatable performance in sustained shooting scenarios. This barrel embodies Faxons commitment to firearm parts that blend practical functionality with professional-grade construction, enabling shooters to maximize their AR-15 platforms potential with confidence.