one of the major mistakes so many people make with a semi-automatic is that they carry it not only loaded, but with a bullet chambered. For example, my gun can carry thirteen bullets in the clip which is more than enough, but you can get fourteen by putting on in the chamber and ready to fire. The problem with this is that guns are far easier to fire if a round is in the chamber. This is how so many parents are shot by children who pick up guns from purses or drawers.