A bore brush is a cleaning tool designed to remove fouling and debris from the inside of a firearm's barrel. It typically consists of a metal or plastic rod with bristles made from materials like nylon or bronze. Bore brushes come in various sizes to fit different calibers of firearms, ensuring effective cleaning without damaging the barrel. Using a bore brush is an essential part of firearm maintenance, as it helps maintain accuracy and reliability. Regular cleaning with a bore brush can prevent the buildup of residue from gunpowder, lead, and copper, which can affect performance over time.