Upgrade your AR-15 build with the Green Mountain 5.56 AR-15 Barrel 14.7" M4 A1 Phosphate. Engineered for precision and reliability, this barrel delivers consistent accuracy and long-term durability in demanding tactical and recreational shooting scenarios. Key Features Chrome-lined bore and chamber for superior resistance to heat, corrosion, and wear, extending barrel life while maintaining smooth feeding and extraction. Phosphate finish provides robust protection against environmental elements and reduces glare for tactical applications. M4 profile with carbine-length gas system balances weight and strength for improved maneuverability without sacrificing performance. 1:7 twist rate stabilizes a wide range of 5.56 NATO and .223 Remington bullet weights for optimal accuracy across various loads. 0.75" gas block journal and 1/2x28 muzzle threads ensure compatibility with standard gas blocks, muzzle devices, and suppressors. Technical Specifications Barrel Length: 14.7 inches Caliber: 5.56 NATO Twist Rate: 1:7 Gas System: Carbine Gas Block Journal: 0.75 inches Finish: Phosphate with chrome-lined bore and chamber Platform: AR-15 Weight: 30.1 oz Why Choose This Barrel This Green Mountain barrel addresses common shooter needs for a lightweight yet durable option that supports reliable cycling and pinpoint accuracy. The chrome lining protects against the rigors of high-volume fire, while the M4-style design promotes consistent feeding. Ideal for custom builds seeking a balance of performance and value in the tactical firearms accessory market. FAQs What gas system length is required? This barrel uses a carbine-length gas system for reliable operation with standard AR-15 components. Is the barrel chrome lined? Yes, both the bore and chamber feature chrome lining for enhanced durability and corrosion resistance. What bullet weights does the 1:7 twist stabilize? The 1:7 twist rate effectively stabilizes 55-77 grain projectiles commonly used in 5.56 NATO ammunition.