Otis Technology modern sporting rifle/AR rifle cleaner designed to help remove fouling and build-up that can cause malfunctions and affect the overall accuracy of your firearm. The Otis Technology modern sporting rifle/AR rifle cleaner is designed to help remove fouling and build-up that can cause malfunctions and affect the overall accuracy of your firearm. This biodegradable and ammonia free formula is safe on all gun metals and will help loosen and remove carbon, copper, and lead fouling.