(image source http://www.colt.com/Catalog/Rifles/AR15A4)
This too is a semi-automatic rifle:
The first one is a Colt AR15A4 .223 caliber rifle. Average magazine capacity: 15 rounds.
The second one is a Springfield 87A .22LR caliber rifle, probably made around 1948. It holds 15 rounds.
Both are semi-automatic rifles.
Both are similar caliber. (For a good explanation of the differences, check this article out. The bullets are essentially the same diameter.)
Neither is an assault rifle. According to this Wikipedia article, an assault rifle is,
An assault rifle is a fully automatic selective-fire rifle that uses an intermediate cartridge and a detachable magazineNeither rifle is fully automatic, therefore neither is an "assault rifle". There really is very little difference in how these two rifles work.
Yet the politicians and liberal news media want the AR banned, because they do not understand what they are talking about.
It is not the gun that is the problem. It is the evil in people that is the problem.