Ohhhhhhh, now i see why you were talking about light guns.
Yeah, a "Supergun" is what they call the little rigs people make so they can play their PCB's on a standard TV. Basically it's a PCB connected to a power supply and a RGB to NTSC composite/svideo card.
Well instead of hooking it up to my TV I want to connect it to my projector, which would be just like connecting it to a VGA monitor, so I need something to convert the RGB signal to VGA... which is where the XRGB-2 comes into play. I just want to make sure it'll work.