The way the wood is mounted is much like cladding/heat shields and since I have a pink AR15 it isn't too much a stretch to imagine a wood clad version, so why not some other using the idea? As for a revolver, there were several revolving rifles in the 1800s so that is sort of practical even though you lose a lot of power in the barrel/cylinder gap. Finally any rifle can be a sniper rifle. all they really are is a very accurate rifle and not necessarily a special purpose one, that is a more recent concept. Is it impractical? Sure but it is more creative than something with absolutely no basis in possibility like a lot of anime weapons.
Then there's a ton of coincidences in this picture; in fact, I'd say that most of this picture is made of coincidences if that is the case.
No, I'm talking about the random subject matter expert coming on saying "You call that a gun? THIS is a gun!" or some other piddling crap to stroke their e-kawk.