In the "Pistol Knowledge" portion of the TRU-Defense Basic Pistol course we talk about how all the moving parts, or action, of the semi-auto pistol work. Here is a good animation of how Glock semi-auto pistols work. Most semi-autos will be very similar in their actions. Any questions?? As always, ALWAYS keep your pistol pointed in a safe direction. ALWAYS keep your trigger finger off of the trigger until you have your sights on target. ALWAYS keep your gun unloaded until you are ready to use it.