Proof that survival of the fittest doesn't always apply to the intelligence of an individual.
Looking at the tube on the shoulder stock, I don't think it comes out of the body of the thrower like it looks in the picture or it obstructs the stock. I expect the tube to go to an external tank.Either the tank is very tiny or wraps around a bunch of stuff, or the photo is photoshopped fake. :(
Was seriously considering buying one.. just for the lulz