Shooter's Choice, Shooters Choice, Copper Remover, 4oz Plastic Bottle WARNING Warning WARNING WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov. Easy to use Restores accuracy in old or neglected firearms Fast acting formula Product Description Shooter's Choice Copper Remover ( 4oz plastic bottle) is a special extra strength formula for tough pistol and rifle cleaning jobs. their Copper Remover quickly removes copper or gilded metal fouling from all rifle and pistol bores.