Great idea for hiding guns in the house if you don't have a gun safe. Or even other items you want to keep safe! It took me a little while to understand this. The shelf unit slides behind a mirror. I thought it was a passage to a hidden room.
Hidden Gun Compartment Behind Sliding Wall Grate. Could also put grate on a piano hinge for easy opening. Good way to hide a weapon in a convenient, but overlooked location. Place them throughout the home. This is some Dexter shit!