I'm not so sure the founding fathers couldn't have imagined semi-auto(or full auto for that matter) rifles. I really don't see them as totally different than what we had back then. Just think about the first cars that were made and the cars today. They both do essentially the same thing, just that today's cars do it much better than the first cars.
Laser guns, nuclear weapons on the other hand maybe not. Even still Heller said the new technologies must be applied to the constitution, and that modern communications fall under 1A protection, even though the founders didn't know about phones or the internet.
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