There are a lot of myths about Australian gun laws around - including the one that all semi-automatic weapons are banned.
You can't own a semi-automatic on a basic gun licence (Category A/B), but getting a Category C licence which allows for basic semi-autos with a magazine capacity of up to five rounds (and this man fired five rounds) is not that hard - you just have to provide a reason for it and pass a slightly more stringent background check (old criminal convictions more than ten years in the past generally won't stop somebody getting an A/B licence if they've been lawabiding since - but they will have a hard time getting more than that). Pig shooting is a perfectly valid reason for a C licence to be issued. And if you are a professional hunter (which these fellows could be), you can even get a D licence which allows a much wider range of semi-autos with greater capacity.
Good to know. Still, it would be nice to have more than a 5 round magazine.
I don’t live in the United States. I live in California. We can have 10 round magazines here.