The Grey Ghost Precision Barrel is manufactured from 416R Gun Barrel stainless steel with tighter tolerances than factory parts. These drop-in barrels deliver better accuracy and better performance. GGP consists of professionals that have an extensive backgrounds in the military and in manufacturing. They have a network of military, industry and shooting sports experts who have helped them refine their firearm specifications and continue to lend their expertise as they continue to develop and expand their weapon system offerings. Their mission is to innovate and produce weapon systems that are accurate, reliable and attainable while ensuring that these platforms are ready for combat and will stand the rigors of hard use and perform with devastating results. The Grey Ghost Precision barrel is the precision manufactured barrel you've been looking for to upgrade your Sig. Features416R Gun Barrel Quality Stainless SteelMatch Grade drop in barrelFinal dimension of +/- 0.003" for co...