one way to win approval for a new pistol is to:
1. Destroy everything in your living room as if a group of bad men have trashed the place (except TV). Make sure that you destroy her favorite item in the room.
2. Then say to wife when she arrive from work, imagine if this happened while we were at home, don't you think we need a new Walther P99 AS + extra magazines + holster + ammo for practice. You may even get approval for advance defense classes.
Destruction of her favorite item may give you approval for a carbine, too.