Pre-threaded and short chambered barrels, precision made to provide superior accuracy. Stress relieved and machine lapped then air gauged with a muzzle-to-breech tolerance of .0001"; furnished with the chamber left .010" short. Requires gunsmith fitting and final chambering. Two popular calibers, ready to fit to your receiver. Military Step, follows the same profile as the military barrel. Drops into issue stock, great for replacing worn out or damaged military barrels. Manufactured by Wilson Arms, 24" long with 6 groove rifling and a 1-10" twist.