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A Combo gun is typically an over-under shotgun/rifle.
A Drilling is typically 2 shotgun barrels on top with a rifle barrel on the bottom.
A Vierling is a 4 barrel setup.
In Europe folks are limited to the number of rifles/shotguns they can own. In this manner they can have one Gun to do it all.
I've always had a soft spot in my heart for a proper drilling. 20ga/7x57r would be my choice.