Drop-in 9mm replacement barrel built for Glock 19 frames. Direct fit on Gen 1, Gen 2, and Gen 3 slides - no fitting, filing, or gunsmithing. Gen 4 and Gen 5 frames need a Gen 3 recoil rod with the standard adapter to run this barrel. Finish Rose gold PVD over a polished stainless steel barrel. The color holds up under range use and pairs cleanly with black, nitride, or two-tone slide builds. Specs Caliber: 9mm Luger Material: stainless steel Twist: 1:16 RH Crown: flush cut Length: 4.02" - Glock 19 standard Fit: Glock 19 Gen 1-4 direct; Gen 4-5 with Gen 3 recoil rod + adapter Lube the top rails of the slide and let the barrel break in over the first 50-100 rounds - tolerances can run tight on the initial install. Confirm the recoil assembly on Gen 4 and Gen 5 frames before the first range trip. See our slide break-in guide for the full procedure. Finish note: The rose gold PVD coating will show wear at metal-to-metal contact points - primarily the locking lug face and barrel hood - over time. This is normal and does not affect function or accuracy. 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.