Type 1 heavy machine gun

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Type 1
Type Heavy machine gun
Place of origin  Empire of Japan
Service history
In service 1941-1945
Used by Japan
Wars World War II, Chinese Civil War, First Indochina War
Production history
Designed 1941
Produced 1941 - 1945
Weight 36.8 kg (gun & tripod)
Length 1077 mm
Barrel length 589 mm

Cartridge 7.7x58mm Arisaka
Action Gas operated
Rate of fire 400-450 round/min
Muzzle velocity 770 m/s (2,500 ft/s)
Effective firing range 1,400 m
Maximum firing range 4,100 m
Feed system Metallic feed trays with 30 rounds
Sights Blade front sight with rear peep sight, graduated from 100 to 2,200 meters, with provision for mounting a telescope.

The Type 1 Heavy Machine Gun (一式重機関銃?, Iti-shiki juu-kikanjuu) was a heavy machine gun used by the Imperial Japanese Army during the Second World War starting from 1941. It was sometimes used as a light anti-aircraft gun during the war in the Pacific. It is essentially a smaller, lighter version of the Type 92 Heavy Machine Gun. It employs the same principles of operation, simply with scaled down components. The barrel is designed to be rapidly changed in the field, as a result the barrel cooling rings have been reduced in size.


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