Carlson's Choke Tubes Choke Tube Cleaner & Carbon Cutter Nonflammable, non hazardous and biodegradable Provides you with a safe and effective way to clean carbon and plastic wad fouling from choke tubes and all of those semi automatic shotguns gas system parts Also works well to clean AR-15 and other rifle bolt assemblies Completes the job in 15 minutes or less Has Lifetime warranty