Storing monatin or a salt thereof in the presence of a radical scavenger andor in a UV light-shielding container is effective for preventing the decomposition of monatin or a salt thereof by exposure to ultraviolet light, particularly under acidic conditions. According to the present invention, the runner segment comprises an insertion projection that can be inserted into an insertion receptacle of the edge guard. The network element inserts indication of the navigation system and a selected mode into the assistance data and constructs the assistance data according to the selected mode. Accordingly, it is possible to simplify a configuration of mounting the diagnostic probe to the body and to reduce a time of mounting the diagnostic probe to the body. The system further comprises a plug assembly including a plug shell and a second retaining ring secured within the plug shell. Wherein rotation of the shaft about the axis causes the second end of the cam to engage a trigger of the firearm thereby discharging the firearm.