"I have 8 pistols and 4 rifles. "
Slacker.
Seriously, I know a couple of gun nuts, and yes, they worry me a little. They are un-balanced people who have a bit of an unhealthy preoccupation with revolution and destruction. And they dont believe in cleaning up after themselves at the "informal range", too.
However, I know a lot of gun enthusiasts, and they are among the most friendly, intelligent and successful people I know. And they generally know a lot more about politics and the Constitution than your average person.
You are not a gun "nut". You are a gun enthusiast.
Your FBI friend is a prejudiced bigot. Check the definition.
Then have him read the Federalist Papers and see what the 2nd Amendment really means.