Yeah it seems that the rest of the world thinks we have a "gun ban" here in Oz. That's far from the truth.
In fact nothing is "banned" as such, but some guns are classified for professional hunters only and it's very difficult to get that status, to the point where semi-auto long guns and pump shot guns are essentially impossible to legally own.
That said, all pump, bolt, and lever-action rifles are ok, lever shot guns are ok, and all revolvers and semi-auto pistols are ok (up to 45cal I think).
Some states don't allow the "sniper" calibers like 50BMG and 338lapua, some do, but then I think 6.5creedmore is legal everywhere. Some states ban some guns because they look to "tactical", some don't.
It's a bit like the US in that regard, rules differ in the various states.
In my state (Queensland) I can own pretty much what I like, no real restrictions on hand guns and only the above-mentioned limits on long guns.
So all this means that semi-auto long guns are not available, so we can forget ARs etc. No real loss IMO but losing the venerable Ruger 10/22 when all this came into practice in 1996 was a blow...that said there is a legal way around that particular limitation and you can own a 10/22 in a slightly different guise.
Another restriction is magazine capacity. AFAIK all states have a 10-round limit on both hand and long guns.
You also have to register all guns and show a "genuine reason" for owning them. The genuine reason is as simple as joining a club and for long guns you don't ever have to attend. Hand guns have to be shot in "competitions" X number of times a year, but many (most?) clubs treat any meeting as a competition so just show up, fire 1 round and go home. A bit of a pain in some ways but I go every month anyway so it makes no difference to me.
That's the gist of it, there are many anomalies and stupidities in the system but it could be a LOT worse.
Most people I know have a safe full of guns, 29 is the limit unless you are a dealer but they don't seem to count and I know people with more than that.