A device to facilitate the process of bump firing wherein a semiautomatic gun is manipulated so as to simulate automatic fire. Bump stocks are buttstocks (See Stock) with a spring which exerts a tension on the action so that continual firing can be achieved by depressing the trigger. Bump stocks were banned by the Trump administration. However, they have generated controversy about definitions and enforcement since proponents claim that one can bump fire without the stock and that the stock does not permit automatic fire in a technical sense.
