Abstract: A piezo-electric trigger lever transmits a signal to a piezo-electric mechanism which releases the firing pin of a firearm. The signal from the trigger lever is passed through an electronic circuit or microprocessor which can process the signal before it is passed on to fire the firearm. The processing may include regulating the firing as a function of the pressure applied to the trigger; preventing operation unless the operator enters a predetermined code into the electronic logic circuit; and, in the case of an automatic firearm, regulate the number of shots fired per trigger pull. The operator may make in-the-field adjustments in these controls. The signal is transmitted from the logic circuit to a second piezo-electric device. This second device deflects to allow the release of the firing pin. Other pressure sensitive piezo-electric devices can be employed to act as safety mechanisms.