Man, I dig these guns so much. I am new the whole Steampunk genre, but from what I have seen it closely relates to the imagery I have in my mind for what science fiction settings should look like. I hope that makes sense.
Here is the link to the site where the pic is from. Alas however, sadly there is no tutorial to be found on how to make these bad ass puppies. But I do know that when spring hits and dollar stores start putting their water guns on shelves, I am making myself some Steampunk-esque weaponary. Tutorials or pics will be posted here for sure. Stay weird!