Centennial Defense Systems MOD4 Stainless Steel Guide Rod Assembly for Smith & Wesson SD9 & SD40 4in Barrel, Burnt Bronze, Button Head Allen Screw, 20lb Spring, 12153

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.