Centennial Defense Systems MOD4 Upper Parts Kit for Gen 1-3 Glock 17 Burnt Bronze Button Head Allen Screw 15lb Spring. Specifications for Centennial Defense Systems MOD4 Upper Parts Kit for Gen 1-3 Glock 17 w/Button Head Allen Screw: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Gun Model: Glock 17 Model Generation: 3 2 1 Package Contents: Centennial Defense Systems MOD4 Upper Parts Kit for Gen 1-3 Glock 17 w/Button Head Allen Screw Stainless Steel Guide Rod Assembly (Button Head Allen Screw) Stainless Steel Channel Liner Stainless Steel Firing Pin Firing Pin Spring Firing Pin Spacer Sleeve Spring Cups (2) Stainless Steel Firing Pin Safety Firing Pin Safety Spring Stainless Steel Extractor Stainless Steel Extractor Depressor Plunger Extractor Depressor Plunger Spring Spring-Loaded Bearing Aluminum Slide Cover Plate What firearm models does the manufacturer say Centennial Defense Systems MOD4 Upper Parts Kit for Gen 1-3 Glock 17 w/Button Head Allen Screw is compatible with? The manufacturer suggests that Centennial Defense Systems MOD4 Upper Parts Kit for Gen 1-3 Glock 17 w/Button Head Allen Screw is compatible with Glock 17Centennial Defense Systems 50741: MOD4 Upper Parts Kit for Gen 1-3 Glock 17 Burnt Bronze Button Head Allen Screw 15lb Spring