The Duke wall art box.

These wall-mounted concealment boxes were designed to provide a secure place to store your favorite handgun and accessories while adding a stylish piece of wall art to your home's decor.  Features a closed-cell foam-lined compartment outfitted with a magnetic safety lock for an extra layer of security.  

https://libertyhomeconcealment.com/blogs/frequently-asked/hanging-instructions

https://libertyhomeconcealment.com/blogs/frequently-asked/foam-inserts

Dimensions

Exterior: 15" x 15" x 3.5"

Interior:  13.25" x 13.25" x 2.5"