Centennial Defense Systems Stainless Steel Guide Rod Assembly for Gen 4-5 Glock 19 No Coating 13lb Spring. This eliminates guide rod flex and ensures it will not chip crack or break like plastic guide rods providing a lifetime of reliable service. Recoil springs are manufactured of certified materials heat treated shot peened and stress relieved to maximize durability. Specifications for Centennial Defense Systems Stainless Steel Guide Rod Assembly for Gen 4-5 Glock 19: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Gun Model: Glock 19 Model Generation: 5 4 Condition: New Package Contents: Centennial Defense Systems Stainless Steel Guide Rod Assembly for Gen 4-5 Glock 19 What firearm models does the manufacturer say Centennial Defense Systems Stainless Steel Guide Rod Assembly for Gen 4-5 Glock 19 is compatible with? The manufacturer says that Centennial Defense Systems Stainless Steel Guide Rod Assembly for Gen 4-5 Glock 19 is compatible with Glock 19Centennial Defense Systems 14057: Stainless Steel Guide Rod Assembly for Gen 4-5 Glock 19 No Coating 13lb Spring