Is it not advisable to just leave the pistol laying flat on its side and secured with the trigger lock inside the cabinet?
I mean is it better for the pistol if it is being stored upright with a barrel support?
That's how I store mine, but without the trigger lock: not required if it's in a safe.
But then, I only have 4 , and they fit nicely on the shelf. Come to think of it, I can squeeze another onto that shelf...
But if you have many handguns, then standing them up allows you more space.