Rival Arms RA50S111S: 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. Features premium spring (stock weight), fully assembled and the rod is CNC-machined from a solid stainless steel billet for a stronger, more corrosion-resistant part. No gunsmith required.