What is this?

[0078265317]

I know this is asking a lot. But anyhow the question is if you blow up the picture in the auction. What is that he has attached to the zapper gun? I don't remember any official nintendo accessories like that. Maybe it is hand made?

http://cgi.ebay.com/NES-Top-Load-Po...0489350386?pt=Video_Games&hash=item2309dd40f2

 

[DBloke]

Looks like a cover.
Some kind of gun holster