Firearm maintenance is a periodic preventive maintenance procedure to ensure the proper function of a firearm. Typically firearm maintenance is performed by the owner of the firearm using simple methods such as cleaning the firearm with gun oils, and lubricating with similar oils and greases. When a firearm presents with physical damage related to the ordinary use of the firearm, or when a firearm malfunctions in a life-threatening manner a professional gunsmith should perform advanced maintenance to determine if the firearm is repairable and/or safe to shoot.