Centennial Defense Systems MOD2 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel w/Flat Face Screw 11lb Spring Nickel. 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 MOD2 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel w/Flat Face Screw: Manufacturer: Centennial Defense Systems Fabric/Material: Stainless Steel Gun Make: Smith & Wesson Gun Model: Smith & Wesson M&P 5in Package Contents: Centennial Defense Systems MOD2 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel w/Flat Face Screw What firearm models does the manufacturer say Centennial Defense Systems MOD2 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel w/Flat Face Screw is compatible with? The manufacturer suggests that Centennial Defense Systems MOD2 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel w/Flat Face Screw is compatible with Smith & Wesson M&P 5inCentennial Defense Systems 12523: MOD2 Stainless Steel Guide Rod Assembly for Smith & Wesson M&P 5in Barrel w/Flat Face Screw 11lb Spring Nickel