[fps]

Trying to cross international borders legally with a firearm for self-defense is really difficult if not impossible. If you talk to Overlanders or international ocean cruisers, almost none of them carry weapons. Trying to sneak or bribe your way across a border with a weapon is a pretty serious crime.

[1] http://www.thehighroad.org/archive/index.php/t-65646.html

[overcast]

I doubt buying a shotgun in Africa when you land is a difficult situation.

[codeduck]

You would be wrong.