EDIT (12/5/23): Updated fit based on feedback.
Hold 6 x of your MP5 magazines in one place.
There are a couple small storage trays built in which also prevent the unit from tipping over. Has been tested to work with MKE, Zenith, and HK steel mags.
I recommend you add some vinyl/rubber furniture pads to the bottom.
The author marked this model as their own original creation.