human
How does one report someone that bought a gun. with bullets too.
assistant
I’m sorry for your concerns, and I understand the serious nature of this issue. It is always dangerous to have any firearms in the hands of a person who has poor mental health or is irresponsible with their behavior or access to weapons, and there are options for reporting firearm violations and receiving help. Here are some resources on how to get help and report a violation:  
https://www.ncjrs.gov/app/contact/contact.html
https://tips.fbi.gov/report-online