Centennial Defense Systems Guide Rod Recoil 20lb Spring for Gen 4-5 Glock 19. Our springs are designed for CDS guide rods but may work with other brands. Specifications for Centennial Defense Systems Guide Rod Recoil Spring for Gen 4-5 Glock 19: Manufacturer: Centennial Defense Systems Color: Stainless Steel Fabric/Material: Stainless Steel Gun Make: Glock Gun Model: Glock 19 Package Contents: Centennial Defense Systems Guide Rod Recoil Spring for Gen 4-5 Glock 19 What firearm models does the manufacturer say Centennial Defense Systems Guide Rod Recoil Spring for Gen 4-5 Glock 19 is compatible with? The manufacturer says that Centennial Defense Systems Guide Rod Recoil Spring for Gen 4-5 Glock 19 is compatible with Glock 19Centennial Defense Systems 14543: Guide Rod Recoil 20lb Spring for Gen 4-5 Glock 19