Barrett Heavy Bore Cleaner is a biodegradable chemical cleaner free of ammonia and petroleum distillates. It is not flammable nor will it irritate the skin. Best of all, it will clean copper and carbon faster and more completely than anything you have ever used. In a two-step process, our bore cleaner first dissolves copper, then chemically binds it to the solution to remove it from the bore. It also works to remove carbon and residue and even neutralizes corrosive salts. Not only does it work great on your Barrett rifle, it works great in pistols that fire copper jacketed ammunition.