Green Mountain 9mm AR-15 16" M4 Finned Nitride Barrel

Engineered for precision and performance in 9mm AR-15 platforms, the Green Mountain 16" M4 Finned Nitride Barrel delivers reliable operation and enhanced handling for your next build or upgrade. This blowback-operated barrel combines a proven M4 profile with distinctive finned design, making it an ideal choice for shooters seeking durability, accuracy, and efficient heat management in a compact package. Key Features and Benefits Nitride Finish: The advanced nitride (Melonite) coating provides superior corrosion resistance, reduced friction, and easier cleaning, extending the barrel's service life even under demanding conditions. Finned M4 Profile: The unique finned design aids in rapid heat dissipation during sustained fire while maintaining the classic M4 contour for balanced weight distribution and compatibility with standard handguards. Optimized for 9mm: Chambered specifically for 9x19mm with a 1:10 twist rate, this barrel stabilizes a wide range of bullet weights for consistent accuracy in pistol-caliber carbine applications. Blowback Gas System: Designed for direct blowback operation, eliminating the need for a gas block and simplifying your build while ensuring reliable cycling with standard 9mm loads. Threaded Muzzle: 1/2x36 threading allows easy attachment of muzzle devices, brakes, or suppressors to customize recoil management and sound signature. Technical Specifications Barrel Length: 16 inches Barrel Profile: M4 with fins Cartridge Compatibility: 9x19mm (9mm Luger) Twist Rate: 1:10 Finish: Nitride / Melonite Gas System: Blowback (no gas block journal) Muzzle Thread Pattern: 1/2x36 Platform: AR-15 Weight: 28 oz Why Choose This Green Mountain Barrel? Green Mountain Rifle Barrel Company has built a reputation for manufacturing high-quality, American-made barrels that prioritize accuracy and longevity. The finned design not only enhances cooling but also adds a distinctive tactical aesthetic, helping your 9mm AR-15 stand out while performing reliably in training, competition, or home defense scenarios. Whether you're assembling a new pistol-caliber carbine or replacing an existing barrel, this component addresses common pain points like overheating, fouling buildup, and inconsistent cycling. Invest in a barrel that combines proven engineering with practical benefits for superior shooting experiences.