To address the original question.

I remember being challenged by some gun control freak. He basically said that it (2A) had to apply to militia (national guard), otherwise anyone could own a tank or nukes. To answer I went through the federalist papers or something similar that addressed the interpretation of 2A as it was intended by our forefathers.

"Arms" by the definition of the day was defined as anything that could literally be carried in your arms. Large explosive weapons and weapons platforms were defined as "ordinance" and not included in the 2A.

I wish I could remember the source I had on that. If I find it I'll post it for you.