Fits Glock 19 Gen 3 OEM frames. Ships fully assembled - completion kit, sights, and cover plate are installed and verified before it leaves our Florida shop. Drop it on your Gen 3 lower and you have a working upper minus the barrel. The slide carries a hard-wearing diamond-like carbon (DLC) finish over a window cut at the muzzle for a lighter reciprocating mass. The top is milled to the Trijicon RMR optic footprint and ships with a cover plate so you can run irons until you mount glass. Included and installed: 3CR Tactical slide completion kit (firing pin, extractor, plunger, recoil rod) Polymer standard-height iron sights (front and rear) RMR cover plate Specifications: Frame compatibility: Glock 19 Gen 3 OEM frames Finish: hard black DLC (diamond-like carbon) Optic cut: Trijicon RMR footprint Caliber: 9mm Luger (barrel sold separately) Optic mounting screws: 6-32 x 7/16" recommended; cover plate uses 6-32 x 1/3" - match your optic manufacturer's screw kit Barrel not included. New aftermarket slides require break-in: rack the slide 200-300 times dry, lubricate the rails, and confirm fitment on your specific Gen 3 frame before live fire. See our slide break-in guide for the full procedure. 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.