It was decided that the calibre would be 130 mm, since the mobile coastal artillery used towed guns of same calibre (130 K 54). A prototype was constructed on the island of Isosaari in 1980, where test firing was conducted until 1983.
The choice was made to establish a caliber of 130 mm, since mobile coastal artillery utilized guns of the same size (130 K 54). A prototype was constructed on the island of Isosaari in 1980, where trials were conducted until 1983.