Non veni pacem mittere, sed gladium.
It certainly looks like a Gatling Gun, which is obviously a crew-served weapon. It would have been fun to see what sort of limber they had pulling it.
Yes, there are many,But we have got,The Gatling gun -And they have not.Kipling
Notice the almost vertical magazine, no spring. One man to crank the handle and another to constantly tap the side of the mag to make sure it continued to feed.