Actually now that I see these side by side, it looks like the first photo has the stock folded in, so it may be the same one.. but this second one has an open trigger, and second picture is just a drawing so it's possible it's the same unit... I think I just solved my own mystery.

The drawing is taken from zenitcamera.com. (http://www.zenitcamera.com/archive/fs/index.html)