I really wanted a 9mm Calico until I read the posts of the many many many owners who had trouble with the magazines.
IMO the company made it seem like you wound up the mag and just fired away 100 rounds until the mag was empty, but what most users wrote was that they'd get 10 or 12 shots and then have to wind the mag, another dozen shots and then wind it up again. And if you overwound it - it was very difficult to fix.
There are some You-Tube videos of the carbines going through 50 or 100 rounds with no winding so - I don't know.