The Ballistic Advantage Premium Series pistol barrel is engineered to meet the demands of discerning shooters featuring hardened 416R stainless steel construction and QPQ corrosion-resistant finish for absolute durability and performance.Ballistic Advantage Premium Series Glock 19 Pistol Barrel4.5" barrel length chambered in 9mmFits Glock 19 Gen 3-5 pistolsThreaded 1/2X28 with included thread protectorSpiral fluted design for weight reduction and coolingHardened 416R stainless steel materialQPQ finish for superior corrosion resistance1:10 twist rate for optimal accuracyPrecision honed lapped and tumbled constructionNo break-in period requiredEach barrel is manufactured to less than .0001 deviation tolerance exceeding factory specifications for maximum reliability and accuracy. Ready for flawless performance right out of the box.