one trigger, both barrels fire at the same time.
If you watch the video he talks about the amount of firepower it unleashes. so instead of getting hit with one bullet at a time, someone is gonna get 2 .45's simultaneously.

Reason for doing it.....?

can we buy it? something tells me that you have to have a permit to buy Class 3 firearms. More than 1 round leaving the barrel with only one pull of the trigger = machine gun.