Although a typical ISSF pistol doesn’t look like something you will see in an action movie, or holstered up as a service duty pistol, they all work and operate the same way with the same concept. Firearms differ in looks, features, and design, but the internal mechanisms all achieve the same outcome. The video below shows how a typical semi automatic pistol works, and will help you gain a better understanding of the inner workings. As mentioned in previous tabs, DVPC is not approved for 9mm, 45ACP, or magnum loads.