The Combat Armory Match Grade Barrel for Glock 19 is a drop in threaded replacement barrel chambered in 9mm, machined from 416 stainless steel and heat treated to RC 41 for exceptional durability. It measures 4.462 inches with a 1 in 10 twist and a 1/2x28 threaded muzzle, built as a direct fit for Gen 1 through Gen 5 Glock 19 pistols.