Cleaning the bore of a gun is a crucial task for maintaining a gun's quality. Gun owners, gunsmiths, and collectors alike can benefit from using this Hoppes Bench Rest 9 Copper Remover. When you fire bullets, copper can build up inside of your gun's bore and because what is known as fouling. This is the most common form of fouling. Buildup of copper can lead to bumps that restrict the bullet's exit. Because of this, the bullet's flight can be severely altered. Nobody wants his or her accuracy to be affected by fouling. Every gun experience fouling, but it can depend on the bore and how many shots are fired. Here are the features of the copper remover from Hoppes. Anybody who handles guns should have the proper cleaning supplies at hand. If you use your guns regularly, you may wish to clean the bore yourself. Gunsmiths, on the other hand, may be interested in purchasing this product for their professional use. If you buy used guns, you may run into fouled bores that need a thorough cleaning.