So, this thing:
This was supposed to be a new and improved type of gravity-fed vortex magazine. Traditional gravity fed vortex magazines lack any way to prevent the follower from colliding with the pusher rod, short of reloading before the mag is empty; this was supposed to fix that problem. The basic idea was simple: make a grav-fed vortex mag and, instead of cutting off the guide tabs on the follower, cut guide slots in the tube. This would allow the guide tabs to halt the motion of the follower in the proper place, as they do with stock vortex magazines.
Things didn't go as planned.