US Patent 10415914 Shot counters and firearms including shot counters

The invention relates to a shot counter for a firearm, which comprises a first magnetic pole, a second magnetic pole, and a coil. The first magnetic pole and the second magnetic pole have a polarization opposite to each other. The first magnetic pole and the second magnetic pole are configured to pass in response to a fired shot the coil one after the other along the track and to induce in the coil a voltage.