This is the genuine Glock OEM slim firing pin assembly for 9mm Gen 5 slides, part number SP39327. It fits the Glock 17 Gen 5, Glock 19 and 19X Gen 5, Glock 26 Gen 5, Glock 34 Gen 5 and Glock 45 Gen 5. Use it to replace a worn or damaged firing pin, or to complete a Gen 5 slide build with factory parts. The assembly includes: Round firing pin Firing pin spring Spring cups Spacer sleeve Fits these Gen 5 slides: Glock 17 Gen 5 Glock 19 / 19X Gen 5 Glock 26 Gen 5 Glock 34 Gen 5 Glock 45 Gen 5 This assembly is for 9mm Gen 5 slides only. Gen 3 and Gen 4 slides use a different firing pin and channel liner, so confirm the generation stamped on your slide before ordering. After installation, function-check the trigger reset and firing pin safety before live fire. 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.