Why are you so eager to waste so much money?
The Supreme Court has ruled against such laws many times.
No, the supreme court has said the right to own firearms is not unlimited, it can certainly describe the sorts of firearms that may be legally possessed and has done so in the past. Apart from that the Constitution can be amended. But this is not to the point, those controlling American politicians have demonstrated that school kids lives are considered a reasonable price to pay for easy access to firearms. So, really, these discussions where the reality of control is pointed out are irrelevant, the greatest country in the world is helpless to change.