The J Dewey Rods 13 inches .30 Cal/8mm adjustable bore saver rod guide is a precision-engineered tool designed to enhance the maintenance and cleaning process of firearms. This rod guide is specifically tailored for .30 Cal and 8mm firearms, ensuring compatibility and optimal performance. Constructed from high-quality materials, the model features an adjustable design that accommodates various firearm configurations, providing a secure and stable fit during use. The 13 inches length offers ample reach, facilitating thorough cleaning and maintenance of the bore. The bore saver rod guide is equipped with a unique adjustable mechanism that allows for precise alignment, minimizing the risk of damage to the bore and ensuring consistent cleaning results. Its robust construction and ergonomic design make it an essential tool for both professional gunsmiths and firearm enthusiasts seeking to maintain the integrity and performance of their firearms. This product is engineered to deliver durability and reliability, making it a valuable addition to any firearm maintenance toolkit. Adjustable bore saver rod guide for rifles with scopes Compatible with .30-8mm Cal Anodized aluminum rod guide tube featuring solvent port Precision-engineered adjustable aluminum locking collar featuring a durable brass pin mechanism Utilize precision-engineered O-rings to effectively seal the chamber, ensuring solvents and oils are securely excluded from the receiver compartment Substitutes the fastener component with a new bolt assembly Compatible with rifles featuring bolt diameters ranging from 0.695 inches - 0.700 inches