The SI 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 stainless steel shaft and anodized aluminum end cap will not rust, crack or break as easily as polymer rods found in oem Glock pistols, increasing it's service life compared to standard recoil assemblies.FeaturesEasily swap different spring weightsMade from 303 Stainless Steel for corrosion resistance and increased toughnessAdjustable fit with the included shims even allows compatibility with the Jitterplug Glock Gen 3 upgradeEndcaps available in 4 different colors, and 3 different designs DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.