I did mention the Mini may not be considered as an assault weapon. It's too bad about the gun laws in those countries when you're traveling inside your home with everything you own. I'm sure the super wealthy don't have those problems when they can travel with their security teams.
Pistol grip AR-15 vs wood stock Mini-14 would be no distinction at all in Australia, England, etc. Both would be totally banned, on a level almost with C-4. You have to pay for bonded armed security guards to transport them to a government armory. On leaving the country, you do it in reverse. MAJOR hassle!
A "field grade" shotgun that is pump action or (legally safest) double barreled is the least problematic anywhere in the world.
Some folks bring an old milsurp rifle, like an Enfield, and call it their "shark gun."
Another tactic is to buy an AK-47 when you arrive in Africa or Yemen, and ditch it when you get to the Med and back to "civilization."