A magazine plug is configured to be positioned in a magazine of a shotgun to reduce the shotshell capacity of the shotgun. A simple method of accomplishing this is to mount a clockworks with a pendulum over or under the image and allow a pendulum end to pass periodically through the real image. Also provided is a heat-conductive silicone cured product obtained by curing this composition. The method further includes evaluating the comparison signal in each case before the first semiconductor element is switched on and in each case before the second semiconductor element is switched on, and detecting one of a first and second non-zero-switching operations based on these evaluations.