I think it's photoshopped.
I think it started as a picture of an O/U shotgun, and had elements added.
I see no indication of a repeating action. The receiver isn't long enough to house a recoil action, and there are no levers or bolt handles. It COULD be pump action, but there's no gap behind the handguard, pulling it back would block the ejection port. It COULD be in the rearward position already, but then one would expect to see a bolt in the rearward position as well.
Frankly, i see no way for any part of this gun to function as a repeating arm, so i strongly suspect the image it faked. To what end? I have no idea.
ETA just noticed the black patch under the handguard, coul be a pump handle. But there's an awful lot of "Why?" and "How?" in the picture still...