The "facts" that I got was:
1. Prior felony firearms conviction that was "nullified".
2. Possession of of a firearm by a "felon".
3. Possession of explosive materials by someone who makes fireworks?
Seems to me that he just pissed off the wrong people.
I wish you the best of luck but I cannot provide advice. It seems very clear to me that he didn't do anything wrong (I think victimless crimes aren't crimes) even with the current laws.