KG-12 was originally developed to clean the copper fouling from large bore military weapons. KG-12 provides professional shooters, gunsmiths, armorers, hunters and other firearm enthusiasts with a product that will remove the toughest copper fouling without damaging the bore. Unlike ammonia-based products, there is no need to neutralize KG-12 or to remove it quickly because KG-12 contains no ammonia. There is no better copper remover out there! The KG family of cleaning products are meant to be used as a system. KG-1 for removal of powder and lead fouling.KG-2 for removal of copper and lead fouling, also works well for polishing bore (1200-1400 grit).KG-12 for aggressive removal of copper fouling. KG-3 solvent and degreaser for removing fouling loosened by KG-1, KG-2 and KG-12.KG-4 gun oil for protecting metal that has been cleaned and degreased with KG-3. Meets military specification Mil-L-63460 D.