Geissele Cut Rifle 7mm Non-Threaded AR Barrel 26in 1-8 4 Hunter 1. These Cut Rifle Barrel Blanks utilize high quality stainless steel made to Geisseles unique specification. The blanks go through a honing process that fixes any potential out of round conditions and helps shape the bore to a more precise size. After honing blanks are air gauged and bore scoped to inspect the bore quality. To deliver the highest level of quality and consistency Geisseles proprietary cut rifling machines are designed and manufactured in-house along with all tooling to provide industry-leading cut rifling in each barrel blank. Every blank is again air gauged and bore scoped after cut rifling to inspect the grooves. Each barrel is then hand lapped to provide an even polish to the bore further enhancing accuracy. Geisseles unique method of contouring ensures that any runout that may be present is removed as the barrel blank is shaped. When consistency is key details matter. For ultimate precision choose Geissele Automatics Cut Rifle Barrel Blanks. Specifications for Geissele Cut Rifle 7mm Non-Threaded AR Barrel: Manufacturer: Geissele Barrel Twist Rate: 1-8 Gun Make: AR Platform Package Contents: Geissele Cut Rifle 7mm Non-Threaded AR Barrel Geissele 30-1313-2700-308-100-01-C: Cut Rifle 7mm Non-Threaded AR Barrel 26in 1-8 4 Hunter