Semi-automatic pistols are magazine fed. When you fire this type of handgun the gas released propels the slide back and forth, which ejects the old round and automatically puts a new round in. In order to fire the first round of a semi-automatic, you will have to load the weapon and pull the slide back to rack a round into the chamber. After this, the weapon will fire a single shot with every trigger pull for as long as it has ammunition. This handgun is quick loading and carries more bullets than a revolver. Some experts believe that the revolver has better functionality as the semi-automatic can jam when being fired, though this is rare.