Whether you're in a restricted state, living in the UK or want a blank AR-15 barrel to do your own drilling on, there are a variety of reasons why someone might want an AR-15 barrel without a gas port. Now, thanks to a partnership between Brownells and White Oak Armament, these port-free barrels are now available to today's shooters. Each White Oak Armament Threaded AR-15 Barrels are machined from 416R stainless steel and still feature a .750-inch gas-block journal, so owners can drill and port for a gas block of their preferred size, if needed. These journals are available at mid-length and rifle-length points on the barrel. Both barrel options are chambered in .223 Wylde and feature a 1:7-inch twist rate, as well as 1/2-28 TPI threaded muzzles. The overall length on the barrels is 18 inches.