18" 6mm ARC 4150 Midlength Medium 1:7.5 Twist Nitride Barrel

18" 6mm ARC 4150 Midlength Medium 1:7.5 Twist Nitride Barrel The 18" 6mm ARC Midlength Barrel delivers long-range capability in a durable and efficient package. Crafted from 4150 Chrome Moly Vanadium steel and finished in black nitride, this barrel is built for superior strength, corrosion resistance, and smooth cycling under extended use. Optimized with a 1:7.5 twist rate, it stabilizes high-BC projectiles for exceptional accuracy at distance. The medium contour offers the right balance of stiffness and weight, while the midlength gas system ensures reliable performance and reduced recoil impulse. Ideal for precision builds, hunting, or extended-range shooting, this barrel lets you unlock the full ballistic potential of the 6mm ARC cartridge in the AR-15 platform. Features 4150 CrMoV Steel Construction - Built for high heat and extended durability Black Nitride Finish - Enhances barrel life and corrosion resistance 1:7.5 Twist Rate - Optimized for stabilizing long, high-BC bullets Midlength Gas System - Promotes smoother recoil and reliable cycling Medium Profile - Balanced for accuracy and weight savings Threaded 5/8x24 Muzzle - Ready for suppressors or muzzle devices Specifications Caliber: 6mm ARC Barrel Length: 18" Twist Rate: 1:7.5 RH Gas System: Midlength Muzzle Thread: 5/8x24 Gas Block Journal: 0.750" Finish: Black Nitride (Melonite/QPQ) Profile: Medium Platform: AR-15 Origin: Made in the USA