Sadly, even making them illegal will not make them obsolete. Criminals will find a way to get their hands on weapons the same as people find a way to get illegal drugs. It may be a silly belief but I don't think assault weapons should have ever been invented.
This page tells seven reasons why the assault weapon ban won’t work. The first is that it didn’t work before. It says that according to studies of the 1994 Assault Weapons Ban, the ban had little effect on reducing gun crime. The second reason is that the assault weapons ban targets the wrong firearms. This section said that according to the FBI Uniform Crime Reports in 2011, of the 8583 firearm homicides that occurred, 6220 were committed by handguns, and only 323 were committed by rifles. The third reason is that the ban targets guns with mostly cosmetic features. This means that by adding or removing features you could affect the legality of your gun. To see the rest of the reasons copy the link below.
There is no concrete, set definition for the term 'assault weapon.' It was previously defined by a set of characteristics that a weapon may or may not have, including such things as a pistol grip on a rifle, a detachable magazine, or even a simple semiautomatic action, the latter two of which are features that even pistols have. These features are useful to civilian shooters for a number of reasons, including the physically impaired. However, due to similarity of the phrases, 'assault weapons' are often confused 'assault rifles' which are weapons such as the AK-47 or the M16, with automatic actions allowing more than single bullet to be fired at a time. This feature is heavily regulated in the US already and is not a feature of the so-called 'assault weapons'. Ultimately, banning 'assault weapons' will only prevent law-abiding civilians from acquiring rifles with features that are commonly found in handguns and can be useful for a variety of reasons.
Look at Australia assault rifles are banned and they have not had anything like the U.S since but they need to get it right and not take collectors historical firearms or farmers rifles for vermin control like they did in Australia then told them they could buy them again 5 years later anything over 5 shot mag is a waste if you are a decent shooter it should only take one shot
The term, as noted to the left, is used erroneously. that does not mean there is a need for many of the items that fall under it to exist in society. I get the idea of "this isn't an assault rifle until I put __ on it, now it is" being a really stupid way to define things, but I don't want the gun in question around regard.
With the recent outbreaks of violence in the United States, such as the movie theater shooting during the latest Batman movie and the massacre in Newtown, Connecticut, people should have very limited access to assault weapons. Making it fairly easy for people to carry guns can help to significantly reduce violence in this country, and could potentially save lives.