I have seen one prototype. Don't know if there are others. I PM'd some members on the possession trail of the earth cerakoted Mac's proto tri edc that will use 2x18350 cells or 1x18650.I did get one response of one of the many owners but am looking for who owns it now or owns one just like it. And to get them to sell it to me . I am an 18650 EDC guy and would think that is perfect for me. I just got my new Mac's tri today and makes me want the longer one even more....:mecry: