"The Ballistic Advantage GLOCK 19 GEN 3-5 Threaded Handgun Barrel is part of BA's Premium Series known for strength and ruggedness. The barrel is constructed from 416R stainless steel for excellence in durability and corrosion resistance. Each barrel is honed, lapped, and tumbled to remove imperfections and offer excellent performance. The Ballistic Advantage barrel is a drop-in part that doesn't require special fitting, lapping, or break-in period. The barrels are made with less than .0001"" deviation, which surpasses factory tolerances optimizing accuracy and reliability. This barrel also meets SAAMI chamber specs. The muzzle features 1/2x28 threads for use with common muzzle breaks and suppressors. This barrel is designed to fit GLOCK models 19 and 45 in 9mm. Ballistic Advantage Premium Series threaded barrel 416R stainless steel construction Drop-in ready No break-in period Made to higher tolerance spec than factory barrels Meets SAAMI chamber spec 1/2x28 threads"