Gun laws of Australia

Gun laws in Australia are mostly in the ruling of Australian states and territories, with the importation of guns regulated by the government. 
After many well-known killings, the government made a more strict firearms law with all state governments. Gun laws were largely aligned with the "National Firearms Agreement." In two government-funded funded gun buybacks and voluntary surrenders and State Governments' amnesties before and after the Port Arthur Massacre
A person must have a "firearms" license to keep or use a "firearm". License holders must show a good reason (which can't be self-defense) for holding a "firearms" license. He/she must not be a "prohibited person". All firearms must be registered by serial number to the owner. The owner must also hold a firearms license.