Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly w/o Spring for Gen 1-3 Glock 17 Glock Tan. 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 MOD1 Stainless Steel Guide Rod Assembly w/o Spring for Glock: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Model Generation: 3 2 1 Package Contents: Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly w/o Spring for Glock Allen Key What firearm models does the manufacturer say Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly w/o Spring for Glock is compatible with? The manufacturer suggests that Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly w/o Spring for Glock is compatible with Glock 17 Glock 19 Glock 20Centennial Defense Systems 12977: MOD1 Stainless Steel Guide Rod Assembly w/o Spring for Gen 1-3 Glock 17 Glock Tan