Lubrication is a vital topic. Many problems - premature wear, inaccuracy - can be caused by the wrong kind of lubricant (as well as too much or too little). "Gun Oil" is by no means the general elixir some consider it to be. "Oiling the barrel" seems popular, but is it necessary? If so, with what? It is very important that precharged rifles are treated to special lubes. 'O' rings and bolt actions require different lubes in turn. The mysteries of molybdenum disulphide and polytetrafluoroethylene are known to us. Rifles with a built-in pump need their own lube. Air chambers of powerful spring rifles must be lubed correctly (if at all) to avoid damage.