A gun mount can rise to fire and lower behind armour to reload

Could a gun mount rise above its armour to fire and then drop back behind the protection for reloading?

Yes. Such a moving mount is mechanically possible.

The exchange concerns a moving gun mount rather than a weapon fixed permanently above its protection. The gun can rise into a firing position and lower behind armour to reload. The brief answer names no ship or historical system, so the passage establishes the mechanical concept without showing how a particular navy implemented it.