This Guide Rod assembly fits MR918/MR920/MR920L & DR920, Glock 19, 23 Gen 4-5. The rod is turned from one piece of 17-4 stainless steel and features a small cross hole to enable easy disassembly and spring replacement. Many rods do not have a cross hole, and you are forced to clamp the rod in something when removing or torquing the screw. This often results in damage to the rod. The cross hole solves the problem. The rod comes with a Shadow Systems chrome silicon spring manufactured to match OEM specifications. This is a long wearing, high quality spring that exceeds the performance of a factory spring, particularly when subjected to substantial heat from extended firing. FeaturesMachined Stainless Steel RodCross hole allows easier maintenance by providing means to "pin"spring in place when changing springs. Also provides location to hold rod when removing or torquing screwHex head screw and washer allows spring replacement or weight changes.DISCLAIMER: This product is not manufactu...