Mk 18 Mod 0 grenade launcher

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Mk 18 Mod 0 grenade launcher
Mk 18 Mod 0 grenade launchers (right and on tripod) at the War Remnants Museum in Ho Chi Minh City.
Type	Grenade launcher
Place of origin	United States
Service history
In service	1960s - 1970s
Used by	United States Navy
Wars	Vietnam War
Production history
Manufacturer	Honeywell Corporation and Aeronautical Products Division
No. built	1200
Specifications
Crew	2
Cartridge	40 x 46 mm grenade
Caliber	40mm
Barrels	1
Action	Hand cranked, manual reloading
Rate of fire	250 rounds per minute
Maximum firing range	375 metres
Feed system	Belt
Sights	Iron sights

The Mk 18 Mod 0 was a 40x46mm grenade launcher used by the United States Navy during the Vietnam War and also the last known hand crank operated firearm since the Gatling gun. It was replaced by the Mk 19 grenade launcher in service with the United States Armed Forces.