Out of sight, like a thief in the night, it would fire as bid then disappear and be hid down into the ground where it could not be found. Dark tunnels kept a secret that slept.
Peter, Riley & I walked through a series of dark tunnels.
We came to a room that concealed the disappearing gun.
Just as a 9mm fires rounds that are 9 mm in diameter, the 8 Inch Disappearing Gun fires shells that are 8 inches in diameter. It was designed to disappear between shots. It retracted below ground where the gun could be hid & reloaded. Learn more here.