Green Mountain 5.56 AR-15 14.5" M4 Phosphate Barrel 1:8 Twist

Upgrade your AR-15 build with the reliable Green Mountain 5.56 AR-15 Barrel in a 14.5" M4 profile with phosphate finish. Engineered for precision and durability, this carbine-length gas system barrel delivers consistent performance for tactical applications and range use. Key Features and Benefits Chrome-lined bore and chamber with phosphate exterior finish - Provides exceptional corrosion resistance and extended service life, reducing maintenance while maintaining accuracy over thousands of rounds. M4 contour profile - Balances lightweight handling with the rigidity needed for reliable feeding and sustained fire in demanding environments. 1:8 twist rate - Optimizes stabilization for a wide range of 5.56 NATO and .223 Remington ammunition, enhancing accuracy for both standard and heavier projectiles. Carbine-length gas system with 0.75" journal - Ensures smooth cycling and reliable operation with standard carbine components. 1/2x28 muzzle threads - Compatible with a variety of muzzle devices for customization and recoil management. Specifications Barrel Length: 14.5 inches Caliber: 5.56 NATO Platform: AR-15 Finish: Phosphate + Chrome Lined Barrel Profile: M4 Gas System: Carbine Gas Block Journal: 0.75 inches Twist Rate: 1:8 Muzzle Thread: 1/2x28 Weight: 29 oz Why Choose This Product Built to mil-spec standards, this Green Mountain barrel addresses common shooter concerns like barrel wear, feeding issues, and accuracy degradation. The chrome lining protects against the harsh conditions of high-volume shooting, while the M4 profile supports versatile builds without adding unnecessary bulk. Ideal for custom AR-15 projects requiring a compact, high-performance barrel. Common Questions Is this barrel pinned and welded ready? It features standard 1/2x28 threading suitable for most muzzle devices; professional installation is recommended for pinned configurations to comply with overall length requirements. What ammunition performs best? The 1:8 twist stabilizes a broad spectrum of 5.56 NATO loads, including 55gr to 77gr projectiles for optimal results across defensive, training, and precision applications.