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. FeaturesPremium spring (stock weight)Fully assembledCNC-machined from a solid stainless steel billet for a stronger, more corrosion-resistant partNo gunsmith required