WHITE OAK ARMAMENT 18" SPR Bbl Rifle Length Threaded, No Gas Port, .223 Wylde Product Features: Machined from 416R stainless steel .750-inch gas-block journal for custom drilling Available in mid-length and rifle-length points SAAMI chambered in .223 Wylde 1:7-inch twist rate 1/2-28 TPI threaded muzzle Overall length: 18 inches The White Oak Armament Threaded AR-15 Barrels are made from 416R stainless steel, are 18 inches long, and feature a .750-inch gas-block journal for custom drilling. These barrels are chambered in .223 Wylde with a 1:7-inch twist rate and have 1/2-28 TPI threaded muzzles, suitable for shooters who need a port-free barrel. If you require this fitting please make contact and we can arrange fitting, proofing and disposal of your old barrel.