ZEV Technologies Glock Gen 1-4 9mm Luger Upper Parts Kit. Specifications for ZEV Technologies PRO Upper Parts Kit 9mm Luger Glock Gen 1-4: Manufacturer: ZEV Technologies Color: Multi Gun Make: Glock Gun Model: Glock Gen 1-4 Except Glock 424343x4445 and 48 Condition: New Gun Type: Pistol Features of ZEV Technologies Upper Parts Pistol Sight Kit: Fits Gen 1- 4. Not Gen-5 compatible. Package Contents: ZEV Technologies Upper Parts Pistol Sight Kit ZEV Striker ZEV Extractor Channel liner Striker sleeve Spring Cups Extractor Rod/Bearing/Spring Assembly ZEV Backplate ZEV Steel Firing Pin Safety and Spring ZEV PRO Striker Spring What firearm models does the manufacturer say ZEV Technologies PRO Upper Parts Kit 9mm Luger Glock Gen 1-4 is compatible with? The manufacturer says that ZEV Technologies PRO Upper Parts Kit 9mm Luger Glock Gen 1-4 is compatible with Glock Gen 1-4 Except Glock 424343x4445 and 48ZEV Technologies PKUPPER9PRO: Glock Gen 1-4 9mm Luger Upper Parts Kit