Drop-in 9mm replacement barrel for Glock 19 - fits all generations (Gen 1 through Gen 5) with no fitting or modification required. Machined from 416R stainless steel and finished in black nitride. Chamber cut and hood geometry match OEM Glock 19 factory dimensions for headspace and lockup - no gauging required. Fit: Glock 19 Gen 1, Gen 2, Gen 3, Gen 4, Gen 5 (all) Chambering: 9mm Luger Twist: 1:16 RH Material: 416R stainless, black nitride finish Muzzle: unthreaded, OEM flush profile Break-in: run 100-150 rounds before evaluating accuracy - the bore polishes in with initial firing. DISCLAIMER: "GLOCK" is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H. Neither 3CR Tactical nor this site are affiliated in any manner with, or otherwise endorsed by, GLOCK, Inc. or GLOCK Ges.m.b.H. The use of "GLOCK" on this page is merely to advertise the sale of GLOCK pistols, parts, or components. For additional genuine GLOCK, Inc. and GLOCK Ges.m.b.H products and parts visit www.glock.com.