Rifles can work in different ways. Some rifles have what is called a bolt action. A small handle is used to move a part of the rifle called a "bolt". By moving the bolt backward, then forward, allows the shooter put a bullet in the chamber ready for firing. It also ejects any spent shells still in the chamber from any previously fired rounds. The rifle in the picture above is a bolt action. Some rifles are semi-automatics, where a bullet is loaded (automatically) and fired each time the trigger is pulled. Some are fully automatic, which work like semi-automatics but allow the shooter to fire more than one bullet at a time by holding down the trigger. The automatic rifle stops firing when the trigger is released or it runs out of ammunition.