Right, so what's in there then?
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
So you've got to have a high-fibre diet to keep your militia regular, and, of course, your right to keep and bear arms shall not be infringed.
Therefore, the founding fathers gave carte blanc to every paranoid-schizophrenic to own and carry anti-personnel mines and SAW's. Now we get to Turtle's point, that that's a wee bit unreasonable, considering we humans have gotten quite efficient at projecting lead. So, therefore, despite the wording, infringement must occur, and Turtle likes to draw his arbitrary line at what police can use. Of course, some want the line arbitrary line in other places, hence all the arguing. But, going by what is there, there is no limitations at all.