Actually when you think about it, he would have been better off with the DANC.  I know several people who are currently on a DANC that work in the firearms industry in several states.  As long as they follow the terms of the DANC which should clearly stat that they are able to continue to work with firearms and ammunition, then they're good to go.  

Upon completion of the terms of the DANC, then the case is dismissed.  NO CONVICTION, with the word "conviction" being the key word.  Though the crime was a petty mis, it appears that HPD is treating it as a DV case as it was against family members.  Had it been a co-worker or some other random individual, it probably wouldn't be an issue.