Griffin Armament ATM, Fits Glock 19 Gen 3/4, 9MM, 4.5 Threaded Stainless Steel Barrel, Black Nitride Finish, 1/2X28 Threads, Includes Micro Carry Comp GAG19G4TB High quality components and precise manufacturing make Griffin Armament parts ideal for maintaining and upgrading firearms. The durability" reliability and excellent build quality of these parts will ensure years of service you can count on.