The Zaffiri Precision match-grade drop-in barrel is a direct replacement for the Glock 17 Gen 3 factory barrel, machined from 416R stainless steel and finished in black for a stealth build inside a slide window or under an assembled cut. The flush-and-crown profile sits even with the front of the slide with an inward crown shape that adds a visual highlight without extending overall length. Specs & features: Match-grade drop-in barrel - 4.37 in overall length 416R stainless steel construction Flush-and-crown muzzle profile Fits Glock 17 Gen 3 pistols and Gen 3-cut slides 100% American made Verify slide generation before install; this barrel is cut for Gen 3 lockup geometry and is not a drop-in for Gen 4 or Gen 5 without a matching slide. Run a factory-weight recoil spring during break-in and check timing after the first 100-200 rounds - tight-tolerance match barrels sometimes prefer a slightly heavier spring to settle into consistent unlocking. 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.