Not to mention the fact that the gun used was a semi-auto, while actual military weapons have a full-auto, or burst fire, setting. Or that the parts in a military gun are Mil-Spec, while the parts in a Bushmaster aren't. It may be considered a legalized clone, but it's certainly NOT a "military weapon".
It's stupidity like this that shows how greedy far too many Americans are. Now, of course, these parents are going to be left with court costs. Those who convinced them to file the suit, though, will simply move on to the next bunch of idiots. Never paying a penny, but using the free publicity.
Utilizing the convoluted logic of this, a bolt-action rifle is, similarly, a military weapon. Same with a lever-action (Winchester Model 1895 in 7.62x54R for Russian troops), a single-shot, and, of course, semi-autos. Heck, even the straight-pull sporting rifles were military issue in many countries like Austria, Hungary, and Switzerland.
Not too mention archery gear, knives, javelins, lances, hammers, axes, and a host of other hand-tools.
I'd also be careful of calling any automobile a "tank", as even that casual association would have a bottom-feeder drawing a line between a Prius, and an Abrams.
They don't seem to be very intelligent, but they are animal cunning.