None of the guns that the Newtown murderer used was an assault weapon under Connecticut law. This illustrates the uselessness of bans on so-called assault weapons, since those bans concentrate on guns' cosmetics, such as whether the gun has a bayonet lug, rather than their function.
What some people call "assault weapons" function like every other normal firearm—they fire only one bullet each time the trigger is pressed. Unlike automatics (machine guns), they do not fire continuously as long as the trigger is held. They are "semi-automatic" because they eject the empty shell case and load the next round into the firing chamber.
Read the article: The Wall Street Journal