A gun is merely a tool in the hands of a user. It has no spirit, no will and it is certainly not the evil menace that the media has portrayed it to be. Any firearm will ONLY do what the user makes it do. There MUST be human interaction. There are many types of firearms that are available, but there are only a few major categories.
Stock is for rifles and shotguns.
Handguns don't have a stock. Barrel - The barrel is the long hollow tube through which the bullet travels on the way to its target. A shotgun is operated with two hands and is shot from the shoulder. It is designed to shoot a shell which consists of pellets of various sizes. The size of the pellet depends on what it is going to be used for.