I don't get #4. What are these special licenses? How tough are they to get and is everyone in Austria eligible to get one or is there a quote on the number? Also are all guns allowed to these people with special licenses? Just curious :)
Technically, everyone who is not a murderer and is mentally sane can get a license. With said license you can get up to 2 semi-automatic guns. Those must be stored at home, locked away and unloaded.
With another license with is much harder to get, you can even carry them around (loaded) and are allowed to own more than 300 rounds.
In order to get full-automatic weapons you need a very good reason and/or the appropriate job or be a member of a guns-club.
Guns that are produced before the year 1870 are avilable to everyone above the age of 21 (if you are mentally sane).
In order to get the permission for more than 2 firearms, you need to extend you license and all guns must be registered and written down in your license.
Theoretically speaking you can get all guns, you can get in the US, in Austria too. It just takes a lot paperwork.