The Zaffiri Precision 3.9" drop-in barrel is a match-grade replacement for the Glock 19 Gen 3 9mm pistol. Machined from 416R stainless steel and finished in black, this barrel is dimensioned as a "flush and crown" - the muzzle sits flush with the end of the slide with a concave inward crown, so the pistol keeps its factory profile while gaining a tighter chamber and a match-grade bore. Specs and features: Fits Glock 19 Gen 3 (9mm) 3.9" barrel length - flush with the G19 slide Concave "crown" muzzle profile (non-threaded) 416R stainless steel construction Black finish Match-grade chamber and bore for tighter groups vs. OEM Drop-in fit - no gunsmithing Made in USA Compatibility: Glock 19 Gen 3 pistols and Gen 3-compatible aftermarket slides only. NOT for Gen 4 or Gen 5 G19 (see the Gen 5 Zaffiri barrel SKU for those). Test-fire and verify feed / lockup before serious use. Do not run reloads or +P+ ammunition with any aftermarket drop-in barrel until you have confirmed fit. 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.