Aspergers does not prevent some one from owning a firearm in the US. In Illinois, the only way mental health issues prohibit someone from owning or using a firearm is if they have been in a psychiatric ward, then they are banned from posessing a firearm for 5 years after that. In Illinos, he will have to get a FOID card if he wants to own any guns or purchase ammo.
_________________
"Gun control is like trying to reduce drunk driving by making it tougher for sober people to own cars."
- Unknown
"A fear of weapons is a sign of ret*d sexual and emotional maturity."
-Sigmund Freud