@H2O MAN,
There are two definitions of the term "Assault Rifle": a functional definition and a political definition.
The functional definition means something which is light and easy to carry arround, for which the ammo is light and easy to carry around, which is just big enough to put a victim out of combat for at least a few months but not so big that recoil interferes with follow-on shots, and it's not even obvious that full auto mode is necessary to meet that definition. My own ideal version of such a thing would look like a 25 - 26 caliber rimfire leveraction rifle similar to the little Henry 22-mag.
The political definition is basically just anything which on a 1 - 10 scale for being scary to demokkkrats, rises above about an eight and a half and that would include the thing in your image.