Pistol

No mechanical device has a will of its own.  A gun never “goes off” unless something causes it to do so.  Guns are safe.  It is people who are dangerous.  The wound delivered by a bullet can easily be fatal.  This means that you should not expect the luxury of learning by experience.  Your first mistake may well be your last.  But you need not make it.  If you are going to live with a firearm it is your responsibility to learn how to use. it.