This 18" AR-STONER LR-308 Barrel is perfect for use in competition or hunting where both accuracy and reliable function are important factors. Chambered in 6.5 Creedmoor this 1 in 8" twist, heavy contour barrel gives you high quality at a great value. Additional features include a rifle length gas port, AR-10 Feed Ramps and 5/8"-24 threaded muzzle. The barrel extension and locator pin are both included and installed at the factory.