Abstract: A firing mechanism for a striker-fired, magazine-fed semi-automatic pistol includes a linear cam that is attached to and moves with a slide. The linear cam moves a cam follower that pivots a reset bar. The reset bar bears upon a trigger bar projection, moving the trigger bar projection out of engagement with a lower end of a sear lower arm as the slide closes. Interference between the reset bar and the trigger bar projection prevents a second pull of the trigger from releasing the sear and moving the sear to the firing position to fire a second round until the pistol is in battery, while allowing the shooter to achieve a high rate of semi-automatic fire.