''The no.3 twin gun is an upgraded version of the 20.3cm twin gun.<br>It is a further improved model of the excellent heavy cruiser main gun.<br>An extremely excellent heavy cruiser main gun with a length of 55<ref>The original 20.3s had a length of 50. This means the barrel length was 10.15m (20.3x50). The no.3 had a longer barrel of 11.165m (20.3x55).</ref> was made.<br>Although this gun is excellent, it wasn't able to be mass-produced due to economic trouble. So only a few prototypes were made.
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''The no.3 twin gun is an upgraded version of the 20.3 cm twin gun.<br>It is a further improved model of the excellent heavy cruiser main gun.<br>An extremely excellent heavy cruiser main gun with a length of 55<ref>The original 20.3s had a length of 50. This means the barrel length was 10.15 m (20.3x50). The no.3 had a longer barrel of 11.165 m (20.3x55).</ref> was made.<br>Although this gun is excellent, it wasn't able to be mass-produced due to economic trouble. So only a few prototypes were made.