And one of the most failure prone of them all: A single trigger!

i always figured a 2 trigger gun was like the old song if the right one dont getcha then the lefy one will... charlie

IMO it's faster and easier to slide your finger back to fire the second shot than to let go and pull again. Over and over I watch guys with Browning O/U's not get the second shot off because they tried to shoot too fast and didn't let go of the trigger enough. If it's got two barrels, it should have two hammers [ hopefully exposed ] and two triggers - period.