The OE-SPEC 18" 5.56 AR15 Barrel is a high-quality components designed for precision and reliability. It features a Target HBAR profile to provide enhanced stability and heat dissipation during extended strings of fire. Constructed by KAK Industry, this barrel is chambered in 5.56 NATO and features a 1:7 twist rate for versatile ammunition compatibility. The 18-inch length offers an excellent balance of maneuverability and increased muzzle velocity for improved long-range performance. • Platform: AR-15 • Caliber: 5.56 • Barrel Length: 18 • Thread: 11 Degree Crown • Gas System: Rifle • Journal: .750" • Material: 41V50 Chrome Moly Vanadium • Color: Black • Caliber Family: 5.56 • Build Grade: Range Ready