Centennial Defense Systems Stainless Steel Guide Rod Competition Kit for Gen 1-3 Glock 17 Stainless Steel No Coating Button Head Allen Screw. The assembly is a complete drop in unit made from solid one piece stainless steel. This eliminates guide rod flex and ensures it will not chip crack or break like plastic guide rods providing a lifetime of reliable service. Flat wound recoil springs are manufactured of certified aerospace spec materials heat treated shot peened and stress relieved to maximize durability. 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 Stainless Steel Guide Rod Competition Kit for Gen 1-3 Glock 17: 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 Stainless Steel Guide Rod Competition Kit for Gen 1-3 Glock 17 Allen Key What firearm models does the manufacturer say Centennial Defense Systems Stainless Steel Guide Rod Competition Kit for Gen 1-3 Glock 17 is compatible with? The manufacturer says that Centennial Defense Systems Stainless Steel Guide Rod Competition Kit for Gen 1-3 Glock 17 is compatible with Glock 17Centennial Defense Systems 13475: Stainless Steel Guide Rod Competition Kit for Gen 1-3 Glock 17 Stainless Steel No Coating Button Head Allen Screw 11lb13lb15lb Springs