Green Mountain M4 10.5" 5.56 AR-15 Barrel Phosphate 1:7 Twist

Upgrade your AR-15 build with the reliable Green Mountain 5.56 AR-15 Barrel 10.5" M4 Phosphate. Engineered for precision and durability, this carbine-length barrel delivers consistent performance in tactical and range applications, helping shooters achieve tight groupings and dependable function even under demanding conditions. Key Features Chrome-lined bore for superior corrosion resistance and extended barrel life, reducing maintenance needs during frequent use. M4 profile provides an optimal balance of weight savings and strength, making it ideal for lightweight builds without sacrificing rigidity. 1:7 twist rate stabilizes a wide range of 5.56 NATO and .223 Remington projectiles for enhanced accuracy across various ammunition types. Phosphate finish over chrome lining offers rugged protection against wear and environmental factors. 1/2x28 muzzle threads allow easy installation of compatible flash hiders, compensators, or suppressors. Specifications Barrel Length: 10.5 inches Gas System: Carbine length with 0.75" gas block journal Platform: AR-15 Cartridge Compatibility: 5.56 NATO Finish: Phosphate with chrome-lined bore Weight: 23.2 ounces Why Choose This Product This Green Mountain barrel addresses common pain points for builders seeking a short-barreled option that maintains reliability. The carbine gas system and chrome lining promote smooth cycling and longevity, while the 1:7 twist ensures versatility for both duty and recreational shooting. Its M4 contour helps manage heat and recoil in rapid-fire scenarios. Whether assembling a new SBR or refreshing an existing upper, this barrel provides the technical foundation for a high-performing firearm. Common Questions Install this barrel using standard AR-15 components and proper headspacing techniques for optimal results.