To keep your firearm in peak condition, use O12-C Carbon Remover to clear out the carbon buildup that can cause jams and affect the accuracy of your firearm. This unique biodegradable formula quickly and effectively removes carbon fouling. Cleans Modern Sporting Rifles/ARs with ease and is recommended for use on bores, bolts, pistons, cylinders, and any other areas with carbon build-up. Safe on all gun metals. 8 oz bottle.