The timber floored upper gun floor had a similar function to the lower Gun Floor. The gun ports here housed lightweight 12 pounder cannon known as carronades.

The cupboard immediately to the left of the door, housed the tools or "sidearms" needed to operate the carronades.

The large opening high above the two gun ports helped the dispersal of smoke and provided additional natural light to flood into the gun floor..

By the steps at the far left hand corner of the Upper Gun Floor there is an ammunition shaft which also acted as a lighting well.  It was used to bring the gun barrels into the floor from the upper bastions. 

At the top of the stairs, just before you step out into the open, there is a door to your left which allowed the gun barrels to be brought into the tunnel system and onto the upper gun floor.