Grey Ghost Precision consists of professionals that have an extensive backgrounds in the military and in manufacturing. They have a network of industry and shooting sports experts who have helped them refine their rifle and pistol slide specifications and continue to lend their expertise as we continue to develop and expand our weapon system offerings. They understand three non-negotiable facts of GGP brand and its offerings; the product has to be Accurate, Reliable, and Attainable.Features :416R Gun Barrel Quality Stainless SteelMatch Grade drop in barrel,Final dimension of +/- 0.003" for consistent accuracy,SAAMI spec. 9mm Match chambers1:10 twist rateChoose from Gen 3-4 or Gen 5Thread Pitch: 1/2 x 28 TPI