Strike Industries's Modular Guide Rod for Gen 3 Glocks is a stainless steel, customizable system that accepts any aftermarket Glock Spring as well as Strike Industries' custom recoil spring weights. Its corrosion resistant stainless steel shaft and anodized aluminum end cap will not rust, crack or break as easily. The end caps come in various colors and designs to add a custom look. The Modular Guide Rod is compatible with G17,17L,22,24,31,34,35,37 models. It includes shims to ensure the guide rod fits a wide variety of Glock slides. This model has a blue finish.