This is a slatwall storage solution for your Magpul PMag magazines for 5.56/.223 AR15 or variant.
This design uses metal slatwall hooks found on Amazon for additional security.
https://www.amazon.com/gp/product/B08CDLCG8X/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
I used Proslat 88105, Heavy Duty PVC Slatwall Garage Organizer, 8-Feet by 4-Feet Section
https://www.amazon.com/gp/product/B00BCJTXVK/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1
I also made a similar solution for Magpul PMag magazines for .308 AR10 and its variants that attaches to the same slatwall with the same metal slatwall hooks.
The author marked this model as their own original creation.