KG-12 4oz KG-12 was developed to clean the copper fouling from large bore military weapons. KG-12 will provide shooters with a product which will remove the toughest of copper fouling without harming any other metal. Unlike other etching, ammonia based cleaners, KG-12 will not hurt the metal of the bore. There is no need to "neutralize" KG-12 like you do with other Ammonia based products and no need to "get it out quick" like ammonia based enchants. KG-12 contains no ammonia . KG-12 is water based . KG-12 will remove the worst of copper fouling, and it will do it fast. KG-12 contains no synthetics. KG-12 was field tested on howitzers (One Million Dollars each) and other large bore guns with outstanding results. When used in conjunction with KG-2, KG-3 and KG-4 you will find no better cleaning system on the market. In general you can call KG-12 the Million Dollar Gun Cleaner!