Think about it.
Bring George Washington to the present and see the look on his face when you do. He would be so damn confused it's not even funny; actually, it is funny. Bring Alexander the Great to the present and see what he thinks of these magical things called guns. And the list goes on.
What do you think would happened if we brought people from the past to the present? Can you imagine their faces when they see a car, phone, fast food places, Walmart, and a lot of other shit? I have a feeling that the Vikings would love it - straight savages.
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Bring the people from the past that came up with the constitution and the 2nd amendment. Show them how far guns have advanced then ask them if they would want to make any changes to the wording.