Equip your AR-15 build with the precision and reliability of the Faxon Firearms Duty Series Barreled AR-15 Upper Receiver in 5.56 NATO with a 16-inch barrel. Designed for shooters who demand consistent performance in training, defensive, or general-purpose applications, this factory-assembled upper delivers a balanced combination of accuracy, durability, and handling characteristics. Key Features 16-inch Gunner-profile barrel machined from 4150 CMV steel with a salt-bath nitride (Melonite/QPQ) finish inside and out for superior corrosion resistance, heat dissipation, and extended service life. Mid-length gas system paired with a stainless steel gas tube and low-profile fixed gas block for smooth, reliable cycling and reduced recoil impulse. 1:8 twist rate stabilizes a wide range of 5.56 NATO and .223 Remington loads for optimal accuracy across bullet weights. 15-inch Faxon Streamline free-float M-LOK handguard provides ample accessory mounting options while maintaining a slim, lightweight profile that enhances maneuverability. Enhanced forged AR-15 upper receiver with M4 feed ramps ensures compatibility and reliable feeding with standard AR-15 lowers. 1/2x28 threaded muzzle with A2 flash hider for effective muzzle flash reduction in low-light conditions. Specifications Barrel Length: 16 inches Barrel Profile: Gunner Cartridge Compatibility: 5.56 NATO / .223 Remington Barrel Finish: Nitride / Melonite (QPQ) Gas System: Mid-length with stainless steel tube Twist Rate: 1:8 BCG and Charging Handle: Not included Weight: 85.2 oz Why Choose This Upper for Your Build The Gunner profile strikes an ideal balance between reduced weight and barrel rigidity, allowing for faster handling without sacrificing stiffness during sustained fire. The mid-length gas system on a 16-inch barrel promotes softer recoil and reliable operation whether running standard or heavier ammunition. By leaving the BCG and charging handle out of the package, you retain full flexibility to pair this upper with your preferred components for a customized, high-performing rifle. This upper is compatible with any mil-spec AR-15 lower receiver, making it a versatile foundation for new builds or upgrades. Manufactured in the USA to exacting standards, the Duty Series upper emphasizes real-world reliability for demanding use. The nitride finish protects the bore and exterior against wear and environmental factors, while the free-float handguard preserves accuracy by eliminating contact with the barrel. Complete your custom AR-15 with this premium barreled upper and experience the difference that thoughtful engineering makes in every range session or duty scenario.