Hold the trigger down and they keep firing! It shoots 6mm soft air pellets. 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. This gun is made by UHC - the leader in airsoft guns. It is made of durable ABS plastic which is the best products available for durability. This gun is full auto but can be used as a single shot if you hold the trigger for one second. To load this gun with ammo you pull back a little slide on the rear site. The batteries go in the handle and there is a safety feature on the side of the gun that won't let you fire unless you press it for added safety. You will love this gun.