The Centennial Defense Systems Stainless Steel Guide Rod Assembly is a dual spring, complete drop in unit made from solid 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. Recoil springs are manufactured from certified Aerospace spec materials, heat treated, shot peened and stress relieved to maximize durability. Fits Glock Models: Gen 5 G23 Factory Recoil Spring Weight: Glock Models Gen 5 G23 Factory Spring Weight is 18lb Alternate Spring Weight: 13 - 15 LB Recoil Springs Are for Reduced Power Loads 20 - 22 LB Recoil Springs Are for Heavy Ammunition Loads +p and +p+ Specifications for Centennial Defense Systems Stainless Steel Guide Rod Assembly w/20lb Spring for Gen 5 Glock 23: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Gun Model: Glock 23 Gen 5 Model Generation: 5 Package Contents: Centennial Defense Systems Stainless Steel Guide Rod Assembly w/20lb Spring for Gen 5 Glock 23