Yes, the gadget above is an actual Wii light gun. Made by Cobalt Flux, Inc., it "preserves independent use of the nunchuck [and] lets you play every game with a gun -- ergonomic pistol grip sits comfortably in your hand." Continue reading for one more picture.
Take the shape of Cobalt Flux's "Dark Ops Wii Light Gun", for example. It's different. Like, it's not a shark. And the finish. It's not white.[via Kotaku - Cobalt Flux]