You won't find your duty in the Constitution.
It's in the Declaration of Independence.
The founding fathers left us a duty to never allow our children to become disarmed slaves.
This duty implies we have a duty to possess the means to do this.
"Prudence, indeed, will dictate that Governments long established should not be changed for light and transient causes; and accordingly all experience hath shewn, that mankind are more disposed to suffer, while evils are sufferable, than to right themselves by abolishing the forms to which they are accustomed. But when a long train of abuses and usurpations, pursuing invariably the same Object evinces a design to reduce them under absolute Despotism, it is their right, it is their duty, to throw off such Government, and to provide new Guards for their future security." - The Declaration of Independence, July 4, 1776.
I don't understand why we don't hear this used in the argument over gun control.
When some libtard asks why you need an AR15 just tell them because the founding fathers said you have a duty to own one.
Then ask the libtard why he has not fulfilled his duty left to him by the men they gave him freedom.
Screw the 2nd amendment interpretation BS.
Your duty is spelled out right in the Declaration of Independence.