Im pretty sure i downloaded the right file for this i had several trials and errors on this. this one fits but is snug I need to adjust it in fusion but it works and im lazy and if i really wanted a perfect fit it wouldnt take much sanding the ammo box i used is this one from amazon.

https://www.amazon.com/MTM-AC3C-3-Can-Crate-Caliber/dp/B077N55R2N/ref=sr_1_1?dchild=1&keywords=mcm+ammo&psc=1&qid=1570499803&sr=8-1

All the 9mm pistol mags i have fit in the holes some are snug but i havent found one that will not work yet. it takes 2 of these to fit the whole ammo box