Centennial Defense Systems MOD5 Stainless Steel Guide Rod Assembly w/o Spring for Gen 1-3 Glock 17 Satin Aluminum Flat Face Button Head Screw. This eliminates guide rod flex and ensures it will not chip crack or break like plastic guide rods providing a lifetime of reliable service. The screw tip is easily removed to allow the user to change spring weights and fine tune the recoil spring to the ammunition of choice. Specifications for Centennial Defense Systems MOD5 Stainless Steel Guide Rod Assembly w/o Spring for Glock w/Flat Face Button Head Screw: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Model Generation: 3 2 1 Package Contents: Centennial Defense Systems MOD5 Stainless Steel Guide Rod Assembly w/o Spring for Glock w/Flat Face Button Head Screw Allen Key What firearm models does the manufacturer say Centennial Defense Systems MOD5 Stainless Steel Guide Rod Assembly w/o Spring for Glock w/Flat Face Button Head Screw is compatible with? The manufacturer says that Centennial Defense Systems MOD5 Stainless Steel Guide Rod Assembly w/o Spring for Glock w/Flat Face Button Head Screw is compatible with Glock 19 Glock 20 Glock 17Centennial Defense Systems 13056: MOD5 Stainless Steel Guide Rod Assembly w/o Spring for Gen 1-3 Glock 17 Satin Aluminum Flat Face Button Head Screw