Ask him 'If you had to stand off against an "Assault Rifle" would you want a Single-Shot?'
That's the best thing I can think of.
The Criminal will ALWAYS have the gun that'll do more damage. If someone REALLY wants to do a mass shooting, not much will stop them.
I want what they have. The odds that I'll have to duel a guy with an AK are pretty low, but if I had too I'd want an AK too.
'A Vote is like a Rifle; It's usefulness depends upon the character of the User.'-Theodore Roosevelt
'In a Man to Man fight, the Winner is He who has one more round in his magazine.'-Erwin Rommel