i think its gotta be an MCG, it looks like its got 3 barrels and a top mounted handle.
i lightened and sharpened the image:
http://img.photobucket.com/albums/v629/SKYeXile/mcg.jpg
also given the angle and position that its been held, its pretty similar to the old mcg, that is holding it at the hip pointed up to the centre of screen.