The KG 12 Copper Solvent is a specialized 4 oz big bore cleaner designed for effective removal of copper fouling from firearm barrels and chambers.KG 12 Copper Solvent Big Bore Cleaner4 oz size for multiple cleaning sessionsFormulated specifically for copper fouling removalSuitable for big bore firearmsProfessional-grade gun cleaning solutionEssential for maintaining firearm accuracy and performance this copper solvent effectively breaks down stubborn copper deposits that accumulate during shooting ensuring your firearms stay clean and function reliably.