Bore Tech Cu+2 Copper Remover, 4 oz Rapidly oxidizes and breaks down Copper fouling by reconfiguring its electronic state 100% ammonia free and barrel safe Will not etch or harm barrel steels and can be safely left to soak in the bore for an Infinite period of time Also contains a short term rust preventative, which shields and conditions the firearm's bore after Cleaning Copper remover that surpasses the rigorous demands of today's top Shooters and cleans Copper fouling faster than traditional petro-ammonia based solvents