This secret bookcase door swings in to reveal a hidden room. Check out the other pics on LadyCarpenter.com for additional pics of the latch mechanism and the inside of the door.
I don’t have much info on this setup found on 1911forums.com, but it shows a secret underground firing range hidden behind a sliding gun cabinet door. If anyone has details, let me know!
This commercial bookshelf does not appear to be a custom installation of any kind. It sets out in front of the wall, different than many bookcase doors. However this one is mounted do a door with sturdy hinges, and supported with a caster. The downfall to using...