Evolution Gun Works Springfield Guide Rod & Spring Kit 4in 14 Number Commander Spring 3.052in .52in Steel Blued Carbon Finish 9 mm

Evolution Gun Works Springfield Guide Rod & Spring Kit 4in 14 Number Commander Spring 3.052in .52in Steel Blued Carbon Finish 9 mm. 052"Rod Diameter:.25"Guide Rod Material:Stainless SteelReverse Plug Material and Finish:Blued Carbon SteelRecoil Spring Type:14lb Flat Wire Commander Spring for 9mm ISMI SpringThis kit reduces recoil and increases longevity of the spring system in Springfield 4" guns.If you have a .45 ACP or .40 S&W you will need the kit with the 22lb flat wire spring available here