Most likely a Dillon Aero M134D Minigun!!
They are a blast to shoot.........pun intended!!! 
http://youtu.be/7Nug5FZgxuk
http://youtu.be/OdvVibVR-e4
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"This is the 44 Magnum AutoMag and holds a 300 grain cartridge and if properly used can remove the fingerprints"!!
COTEP # CBOB0152
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