The original specifications were for a 5 inch gun with water-cooled barrel, firing folding-fin discarding sabot dart projectiles, two rotary magazines each holding 14 rounds, for a high rate of fire.
The original specifications were for a 5 inch gun with water-cooled barrel-fin discarding sabot dart projectiles holding 14 rounds. This was for a high rate of fire. Sabot dart projectiles were two rotary magazines each. Cooled barrel was firing folding.