When the constitution was written, guns were single shot device. You could shoot one person from not so very far away then had to stand there and reload. The framers of the constitution would understand these multi-shot, large magazine, quick reloading guns more in the context of a bomb than a gun. Thinking that any of them, even Ben Franklin, could envision days like today is like looking to the constitution to decide what kind of cell phone to buy, it just wasn't on their radar. In fact they wouldn't even know it wasn't on their radar because there was no radar back then.
In addition to banning bombs, we also ban guidance systems on privately owned rockets and other sorts of advanced weapons technology. Some jurisdictions ban police scanners as well, for obvious reasons. At some oint we need to be pragmatic about distinguishing between guns for hunting, guns for self defense, and guns for mass murder. I don't see any good reason any privately owned gun needs to fire more than 6 shots.
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