Absolutely nothing. Here in Australia we are not allowed to carry guns, knives or even sling shots on your person. Even a Swiss army knife needs to reason\purpose for carry it. ie Camping\fishing etc. Sporting shooters can have registered firearms but can only have them in the car to and from the range\property etc. Even need to show your shooters and identification to buy ammo. We have no rights to use firearms for personal or property protection. Police have powers here in NSW to stop and search powers if they believe someone has a weapon. So the only ones running around shooting up places or people are the underworld gangs and the police seem powerless to do anything about them except to raid their houses weeks after an event.