9mm Luger chamber forming with reamer and burnishing tool.

A chamber burnishing tool can be used to improve the surface finish of a cartridge chamber. By rolling over the surface of the chamber the rollers smooth the metal surface to a mirror finish. This process is used by many of the major firearm factories but it can be done by amateur and professional gunsmiths as well. This video shows how to use the burnishing tool and the results can be seen by examining a burnished 9mm Luger chamber.