OK, I finally found the pics and what I had wasn't it (again, I'm at work, can't post any pics right now). The grip/stock I was remembering was made by ROWI, and they appear to be from Australia. The shoulder piece is slightly different in shape, but it does have the strap attachments like the Fett gun, which is what was triggering the memory. The grip is different, the attachment point of stock to grip is different... well, it's just not it. Sorry for the false alarm. They show up on ebay from time to time, so you should be able to see the difference there.
Jim