When electricity flows through the transmitter coil, it creates a magnetic field all around it. If you sweep the detector above a metal object (such as this old gray spanner), the magnetic field penetrates right through it. The magnetic field makes an electric current flow inside the metal. Metal detectors detect metal. They do not specifically define which guns are unless they produce a silhouette of whatever set it off. Ergo a metal detector will detect metal in anything containing metal whether or not it is a firearm.
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