The United States constitution clearly states that a "States militia must be well regulated and maintained." A weapon of a "States militia" is an assault rifle. Any ban would violate the United States constitution.
More pretzel logic from the party of twisted thinking. Reading the Constitution, the second Amendment says: "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." It doesn't say the "unfettered right of the people" shall not be infringed, so the law provides for regulation of gun rights. Only the right to own a gun is guaranteed.
And no you are not guaranteed the right to military grade weapons. Not to mention that while the technology existed to make repeating weapons, they were both difficult and expensive to make, and were not widely available until 1830. It took a minute to reload after firing and prepare for another shot.
Those guns should not be on the streets, and I'm thinking the Founders would be shocked and horrified and what has happened to the USA as a result of the 2nd Amendment.
A militia is defined as "a military force that is raised from the civil population to supplement a regular army in an emergency". You have to be a member of a "well regulated militia" to have unfettered access to weapons under the Second Amendment. That would be the National Guard, so if you're Guard Member, you get to have a gun, but otherwise, not so much.