The Ballistic Advantage Premium Series pistol barrel is engineered for Glock 17 Gen 5 pistols featuring 416R stainless steel construction and precision 1/2X28 threading for superior performance and durability.Ballistic Advantage Premium Series 9MM BarrelDesigned specifically for Glock 17 Gen 55-inch barrel length with 1/10 twist rateThreaded 1/2X28 with included thread protectorHardened 416R stainless steel constructionQPQ finish for corrosion resistanceHoned lapped and tumbled for precisionLess than .0001 bore deviation tolerancePerfect for shooters demanding precision accuracy and reliability this threaded barrel requires no break-in period and delivers factory-exceeding performance for tactical applications competition shooting and suppressor use.