When the slide nears the rear of its travel, the casing bounces off the tip of the ejector and out the ejection port on the side of the slide. As the force of the slide's rearward motion subsides, the kinetic energy stored in the compressed recoil spring drives the slide back toward the front of the gun. Rounds are pushed down and back into the top of the magazine by finger pressure, one by one until the desired number of rounds have been loaded. Then, grasp the slide firmly, pull the slide back against the spring tension about two inches, then let go of the slide. As the slide snaps back into place, it loads the first round from the top of the magazine into the firing chamber.
Subsequent shots are always single-action.
In this case, the first shot will be double-action. If it is desired that the first shot be single-action, the safety must be off at the time the first round is chambered. In this case, the trigger pull on the first shot and subsequent shots will be identical, very short and smooth. If it is locked, then it is automatically decocked. Once a round is chambered and the safety is off, the gun will fire one shot each time the trigger is pulled.