Tungsten guide rods provide a decisive advantage for all Glock owners by providing more weight at the front of the gun. At least a full ounce! This extra weight will help reduce muzzle rise allowing quicker follow up shots. Special features include a rigid Tungsten body that improves lock up by completely removing "guide rod flex". The hex screw removable tip allows the user to choose various spring weights that will calibrate the ammunition to his gun. Used by Law Enforcement and competitive shooters world wide/ . These guide rods will not chip or crack like the factory plastic guide rods are prone to. Will not damage or wear your polymer frame, and guaranteed to provide a lifetime of reliable service.