12.7 cm/40 Type 89 naval gun
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The 12.7 cm/40 Type 89 naval gun was a Japanese anti-aircraft gun introduced before World War II. It was the Imperial Japanese Navy's standard heavy AA gun during the war. Wikipedia
Barrel length: 5,080 millimeters (16 ft 8 in) (bore length)
Caliber: 12.7-centimeter (5.0 in)
Maximum firing range: 9,440 meters (30,970 ft) at 90° (AA ceiling); 14,800 meters (48,600 ft) at 45°
Rate of fire: 8-14 rounds per minute
Shell: Fixed 127 x 580mm.R