Who is the largest manufacturer of weapons in Australia?

Can you enlighten me on the identity of the leading producer of weapons in the land down under, Australia? I'm curious to know which company holds the Mantle of being the biggest manufacturer of firearms or military hardware within the country's borders. Is it a domestic enterprise that has risen to prominence or perhaps a multinational corporation with a strong foothold in the Australian market? I'm intrigued to learn more about this entity and its influence on the country's defense and security landscape.