In military usage, the word "firearm" is used for the type of weapons that soldiers carry. Most of them are either pistols or rifles. Guns that are small enough to be carried and used by one person have the same basic parts: a trigger, a barrel, and a handgrip or stock. The trigger is pulled by a finger to fire the weapon which releases a bullet. The barrel guides the bullet which then flies to the target. The handgrip is held by the shooter's hand. Guns can be very effective weapons. Their bullets fly faster than an arrow or spear. Their high kinetic energy makes them more lethal. They also shoot from far distances. Bullets are usually non-explosive pieces of metal.