Mk 20 Mod 0 grenade launcher

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Mk 20 Mod 0
Mk 18 Mod 0 & Mk 20 Mod 0 Grenade Launchers at War Remnants Museum (Ho Chi Minh City).jpg
Mk 20 Mod 0 Grenade Launcher (left) at War Remnants Museum (Ho Chi Minh City)
TypeAutomatic Grenade Launcher
Place of originUnited States
Service history
Used byUS Navy
WarsVietnam War
Production history
ManufacturerNOS Louisville
Specifications
Mass26 pounds
Length27 ins
Barrel length12 ins

Cartridge40x46mm SR
ActionBlow-forward
Rate of fireSemi-Automatic
250-275 RPM Full Automatic
Muzzle velocity250 feet per second
Effective firing range350m
Maximum firing range400m
Feed system24 round belt
SightsIron

The Mk 20 Mod 0 was a 40mm automatic grenade launcher manufactured by NOS Louisville and was used by the US Navy during the Vietnam War. It used the Blow-Forward operation that was previously used on semi-automatic pistols such as the Steyr Mannlicher M1894 and Schwarzlose Model 1908. The Mk 20 was eventually replaced by the Mk 19 Mod 3.

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