Rival Arms RA50G101T: Experienced shooters realize plastic guide rods can chip, crack or break resulting in feeding or ejection failures, flex can also contribute to accuracy problems. Rival Arms Guide Rod Assemblies address all of these issues and will provide you a lifetime of reliable service. The guide rod is premium spring (stock weight) and fully assembled. It is CNC-machined from tungsten billet for a stronger, more corrosion-resistant part. No gunsmith required.