Complete shop-assembled and function-tested RMR slide for Glock 19 Gen 3 frames. Built and function-tested in our Florida shop on a Matrix Arms Alpha black stripped slide blank - lightning-cut for reduced weight and cooling, with a polished stainless barrel and full internals installed. Drop-in fit, no gunsmithing required. Features Matrix Arms Alpha stripped slide blank, black finish - RMR optic cut with lightning cuts that shave weight and show off the barrel Installed 9mm polished stainless steel drop-in barrel - crown/flush cut 3CR Tactical slide completion kit pre-installed (firing pin assembly, extractor, plunger assembly, springs, recoil rod, cover plate) Tall co-witness polymer sights pre-installed and aligned - visible above a mounted optic RMR footprint optic cut for Trijicon RMR / SRO and compatible red dots (Holosun 407C, 507C, etc.) - direct-mount, no adapter plate required Fully assembled and function-tested in our Florida shop - no gunsmithing required Manufacturer Part Number: CMP-MX-ALP-G19-BLK-TS-POL Specifications Caliber: 9mm Compatible host: Glock 19 Gen 1-3 frames - will NOT fit Gen 4 or Gen 5 Slide: Matrix Arms Alpha, black, RMR cut with lightning cuts Barrel: Polished stainless steel, crown/flush cut Sights: Tall co-witness Optic Mounting Hardware Cover plate screws: 6-32 x 1/3" Optic mount screws: 6-32 x 7/16" For optic installation, use the mounting kit included with your optic (Holosun, Trijicon, Sig, Vortex, etc.) - manufacturer kits have the correct torque spec, head shape, and threadlocker. The dimensions above are for reference when sourcing a replacement cover plate or aftermarket hardware. Optic mounting hardware is not included with this slide. Break-in and care Lube all slide rails and contact surfaces before first use. Run approximately 200 rounds of standard 9mm ammunition during break-in before moving to duty or self-defense loads. Confirm your lower is a Glock 19 Gen 1-3 pattern before fitting. Shop-assembled and shipped by 3CR Tactical. Build it complete: this slide is also sold as a slide + frame parts kit combo - the same slide paired with the 3CR Tactical frame parts kit, bundled for less than buying the two separately. GLOCK is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or 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 aftermarket Glock pistol components. For genuine Glock, Inc. and Glock Ges.m.b.H products, visit https://us.glock.com .