Kleen-Bore RG2BCASE: Rust Guardit provides protection against rust and corrosion with deep penetration into the pores of your firearm\'s metal. This unique formula protects the inside and outside of the firearm. Rust Guardit cleans all fouling, primer residue, plastics, and dirt from both the interior and exterior of your firearm. It also lubricates to withstand high heat and pressure during firing, ensuring smooth performance with every shot and protects against rust and corrosion, even in the presence of water.