I read that thread. Kind of dusty and the video does not work. One of the links to a vendor Roberts? had about every kind except the B&T APC9 loader. The APC mags are about the hardest to hand load as I have found.
I don’t have an APC9, but I use a universal loader from ETS Universal loader for my AR mags and MP5 mags. If the APC9 mag is similar size, it will should work. I do know that my MPX magazines are too wide and will not fit this ETS loader. https://www.etsgroup.us/ETS-Group-C-...scam-rifle.htm
I also have an MP5 loader made by B&T... this thing is super fast when loading from an ammo tray. See video: https://www.youtube.com/watch?v=himrMwJ7gn8
B&T website shows the same kind of loader for APC9, but I don’t know where they have availability.