Oh Japan, you come up with some of the craziest things. This photo is of a Tokyo Marui Glock hidden inside a fake fish. It would be great if it did nothave the 5.56 belt sticking out of the fish. I suspect that this might be an Electric pistol so it is full auto and does not have a reciprocating slide like a gas blow back gun.
Now while this is an airsoft gun inside a fake fish, the concept is not unheard of in the world of firearms. This sort of reminds me of the Corner Shot Cat.
Now a cat does seem more practical than a fish. Just think, you are walking down a street. Which would seem out of place to you? A stuffed plush cat or a fake fish? haha
I do have to give credit to the person that came up with putting his Glock in a fish. It is different.