Why a certain number?? Is a person any more dangerous with 10 firearms vs 5? You are either sane or not - the number is not the issue.It is impossible to legislate against insanity so banning any type of weapon is pointless.
The person should have some sort of effective mental health and personality test. Successful applicants should then have a license to possess a certain number of firearms with secondary level applications should they have a legal need for more.
