This AR-STONER LR-308 Barrel is perfect for use in competition or hunting where both accuracy and reliable function are important factors. Chambered in .308 Winchester this 1 in 10" twist, barrel gives you high quality at a great value. Additional features include AR-10 Feed Ramps and 5/8"-24 threaded muzzle. The barrel extension and locator pin are both included and installed at the factory. Compatible with all LR-308 pattern rifles. All finished barrels go through a 100% inspection process. Inspections Equipment includes CMMs and Air Gauges for the bores as well as visual and machine inspection.