Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly for Gen 1-3 Glock 19 11lb Black. 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 MOD1 Stainless Steel Guide Rod Assembly for Gen 1-3 Glock 19: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Glock Gun Model: Glock 19 Package Contents: Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly for Gen 1-3 Glock 19 What firearm models does the manufacturer say Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly for Gen 1-3 Glock 19 is compatible with? The manufacturer says that Centennial Defense Systems MOD1 Stainless Steel Guide Rod Assembly for Gen 1-3 Glock 19 is compatible with Glock 19Centennial Defense Systems 10637: MOD1 Stainless Steel Guide Rod Assembly for Gen 1-3 Glock 19 11lb Black