SKS - 7.62 x 39 ammo is plentiful in Eastern Europe and SKS is a reliable semiautomatic carbine that is hard to break.
CZ 75 - once again, it's reliable and the 9mm ammo is easy to find all over Europe. High mag capacity is pretty nice as well.
AKM - The very best there is. When you absolutely, positively have to kill every motherfucker in the room, accept no substitutes.