Hold the trigger down and they keep firing! It shoots 6mm soft air pellets. It requires 4 AA (not included) Each gun comes packed with 100 pellets in a beautiful color box. Don't forget to order extra ammo. These shoot farther and faster than most full auto airsoft guns. You will not be disappointed with the quality or the durability. These guns are made of super hard ABS construction. They are a 1/3 scale model of the real thing. To fire this powerhouse all you do is load the airsoft pellets into the top, (pull the back of the scope out) put the batteries in the handle then push the safety button on the side and pull the trigger. This gun can be fired semi auto if you just pull the trigger for a second. This gun fires as long as you pull the trigger. Batteries usually last 10,000 rounds or more.