I wanted to hook a magazine into the prepper chest rig, however It won't let me for what ever reason. It will allow me to put a 7 round mag .45 into it, but won't let me put the 13 round mag .45. Also doesn't allow me to put the NATO 556x45 or x39 in the rig as well.

I'm assuming this is due to mod compatibility does anyone know of a mod that fixes this? Or is it intended to only fit smaller mags in the rig?