Abstract: A screw gun includes a housing, a motor assembly supported in the housing, a drive assembly configured to receive a rotational output from the motor assembly. The drive assembly includes an input shaft and an output shaft coupled to the input shaft for rotation with the input shaft. The output shaft is translatable along the input shaft from a depressed position to an extended position. A spring engages the output shaft to apply a biasing force to the output shaft to bias the output shaft to the extended position. The screw gun also includes a switching assembly including a link coupled to the output shaft, a rocker engageable by the link and including an activation element, the rocker pivotable between a first position and a second position, and a sensor configured to generate an output signal dependent on a position of the activation element.