Japanese 127mm Anti-Aircraft Gun Type 89 (1929)
Technical Information

Background
The 127mm Anti-Aircraft Gun Type 89 (1929) also known as 12.7cm gun (5" gun) was the largest Imperial Japanese Navy (IJN) anti-aircraft / dual purpose gun, also known as 12.7cm gun.  Mounted in single or dual mounts. This gun was semi-automatic, with a horizontal wedge type breech block, automatic rammer and fuse setter. The traverse and elevation were powered by an electric motor. Originally designed for use on ships, this gun could also be installed on land. Some guns had a large shield.

Technical Details
Caliber 127mm (5")
Muzzle Velocity 2,360 feet/sec
Shell 14 1/2 lbs
Rate of Fire 12 rpm (per barrel)
Vertical Range  24,300 feet
Horizontal Range  15,400 yards
Total Weight  25.3 Tons (aprox)
Ammunition  HE, AP (50.5 lbs)
Fuses  Type 91 55, 30 sec