Type 3 80 mm AA Gun

8cm/40 3rd Year Type naval gun
An 8cm/40 3rd Year Type gun captured at Guadalcanal
Type	Naval gun
Place of origin	Empire of Japan
Service history
In service	1914–45
Used by	Imperial Japanese Navy
Wars	World War I World War II
Production history
Designed	1914
No. built	69 (plus possibly spares)
Specifications
Weight	600 kilograms (1,323 lb)
Barrel length	3,048 millimeters (10 ft 0 in) (bore length)
Shell	Fixed
Shell weight	5.67–5.99 kilograms (12.5–13.2 lb)
Caliber	7.62-centimeter (3.0 in)
Breech	sliding breech block
Carriage	pedestal mount
Elevation	-5° - +75°
Traverse	360°
Rate of fire	13-20 rounds per minute
Muzzle velocity	670–685 meters per second (2,200–2,250 ft/s)
Maximum firing range	10,800 meters (11,800 yd)
Flight ceiling	5,400 meters (5,900 yd) (eff. ceiling)

The 8 cm/40 3rd Year Type naval gun was a Japanese naval anti-aircraft gun introduced during World War I. Although designated as 8 centimeters (3.15 in), its shells were 76.2 millimeters (3 in) in diameter.

It was installed on the Sendai-class cruiser, Chikuma-class cruiser, Tenryū-class cruisers, Kuma-class cruisers, Nagara-class cruisers, Japanese cruiser Yūbari, Ise-class battleships, Fusō-class battleships, Japanese aircraft carrier Hōshō, Japanese submarine tender Komahashi, Jingei-class submarine tenders.

During Pacific War the gun was thoroughly obsolete, relegated to secondary duties on smaller ships like Ning Hai-class cruisers, Japanese minelayer Itsukushima, Akagi Maru-class Armed merchantmens, and especially gunboats. Some guns were given to civil air defense in the Southern Japan.