Mk 20 Mod 0 grenade launcher

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.

Mk 20 Mod 0 grenade launcher
Class Manportable
Type Rocket Launcher
Manufacturer Naval Ordnance Station Louisville
Origin United States of America
Country Name Origin Year
United States of America 1955
Country Name Operational Year Retirement Year
United States of America View
ManufacturerName Production From Production To Quantity
Naval Ordnance Station Louisville View

Type Automatic Grenade Launcher
Place of origin  United States
Service history
Used by US Navy
Wars Vietnam War
Production history
Manufacturer NOS Louisville
Weight 26 pounds
Length 27 ins
Barrel length 12 ins
Cartridge 40x46mm SR
Action Blow-forward
Rate of fire Semi-Automatic
250-275 RPM Full Automatic
Muzzle velocity 250 feet per second
Effective firing range 350m
Maximum firing range 400m
Feed system 24 round belt
Sights Iron

End notes