Cd. 508mm Gun M1913 (20-inch gun)
A Russian-designed gun modernized by the Soviet Union for use in World War II. It was primarily used as a coastal defense gun and in siege operations.
Cd. 457mm Gun M1913 (18-inch gun)
A Russian-designed gun modernized by the Soviet Union for use in World War II. It was primarily used as a coastal defense gun and in siege operations.