The company Neural-Robotics here in Huntsville has modified one of their AutoCopters to carry the AA-12 automatic shotgun.
The AA-12 is a fully automatic 12 gauge shotgun with a 13'' barrel. Able to fire all current 12 gauge rounds along with the Frag-12 high explosive anti-armor and anti-personnel rounds.
NRI has the video of the initial test.
Click here to download.
Login ID: autocopter
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If you want to know more about the AutoCopter, there is a product briefing available here.
There is also a Q&A about the AutoCopter.
The complete story can be found here.