I'm probably going to offend you by starting out this way, but: There is no such thing as an assault weapon. Assault is a verb, it's an action. If you have the intent to hurt someone, by the very act of hitting them, you have committed Assault.
From the Law Dictionary: Assault. ... An assault is carried out by a threat of bodily harm coupled with an apparent, present ability to cause the harm. It is both a crime and a tort and, therefore, may result in either criminal or civil liability.

Under that definition, any weapon may be an Assault weapon; from a knife to a baseball bat, to a rifle.

That's why you can't get a ban on Assault weapons. The description would be too varied.

Like I tell other people, an AR-15 is variation of the .308 hunting rifle. It is a semi-automatic firearm, which means that it fires one round for every pull of the trigger, without having to pull back a bolt, seat a round, and push that bolt forward.
Almost every gun today is a semi-automatic, from the venerable revolver to the AR-15.

An Automatic weapon is one in which you can fire more than one shot with each pull of the trigger, and those weapons are illegal without a federal automatic firearms license.

First off, in order to pull of an assault weapons ban, you have to outlaw Assault....which, by the way, it's already illegal to assault anyone. Doing so comes with a prison sentence that varies in response to the level of the assault.

My next question is this. Are you wanting to get rid of the AR-15 because it looks Scary?

This is an AR-15.......(above)

A .308 hunting rifle. (Above)

Does the addition of the muzzle break, the plastic handguards (The pieces that surround the barrell.) and the pistol grip make it an assault weapon?
No, what makes it an Assault rifle is the human action that follows, namely the taking of life.
Stop blaming the damn rifle, and start blaming the criminals that carry out the act.