!!! DO NOT PRINT THIS!!!
!!!NEW VERSION AVAILABLE!!!
https://www.thingiverse.com/thing:6445783

For this boxmag you need a Torque Hopper and disable its clutch. (I did it with tape)
A tube is aswell required. (28mm outside diameter, inner diameter aboutaround 22mm)
This design is far from perfect so you have to do some rework after printing. See the pictures for more details.