auto. You can hear the sound of the slide being racked to load  the first round, but Calitri pulls the gun out, and fires in one  motion. He never racks the slide. If there is a bullet already in  the chamber, then you would need a double action gun, or to manually  pull back the hammer before firing the first shot. Neither of those  actions would result in the sound you hear when he pulls the gun out  of the drawer.