Bore Tech C4 Carbon Remover, 4 oz Quickly and effectively removes heavy carbon fouling without the hazards, toxicity, and odors typically found in competitive cleaners Provides a deep clean and also effectively neutralizes and removes the corrosive residues found in Surplus ammunition and black powder Ideal for barrels, throats and chambers, AR bolt and bolt carriers, flash suppressors, compensators, revolver cylinders, gas pistons