Most people believe that a dual, stemming from the Latin word 'duo' meaning 'two', is to take place between two people. Recent historical texts have come to light showing this to be a misfire of translation by Swiss academics. A true dual takes place when simultaneously firing two, double barreled pistols. If two people were to do this at once it would be called a 'dual-quatro' ... which has happened only twice in recorded history. The Arsenal Firearms 'AF2011-A1 Double Barrel Pistol' is the first industrial double barrel semiautomatic pistol and is a beautiful thing to see in action for anyone who's not looking down the barrels.