The Mk 20 Mod 0 was a 40mm
automatic grenade launcher An automatic grenade launcher (AGL) or grenade machine gun is a grenade launcher that is capable of fully automatic fire, and is typically loaded with either an ammunition belt or magazine.
These weapons are often mounted on vehicles or helicopter ...
manufactured by NOS Louisville which was used by the US Navy during the Vietnam War. It used a
blow-forward
Blow-forward is a firearm action where the propellant gas pressure and the friction of the bullet traveling down the bore drag the whole gun barrel forward to facilitate the opening of the breech. This forward barrel motion provides most of t ...
mechanism 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.
See also
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Comparison of automatic grenade launchers An automatic grenade launcher (AGL) or grenade machine gun is a grenade launcher that is capable of fully automatic fire, and is typically loaded with either an ammunition belt or magazine.
These weapons are often mounted on vehicles or helicopt ...
*
Mk 18 Mod 0 grenade launcher
A Mk 18 grenade launcher in use on a M2_Browning.html" ;"title="Patrol Craft Fast (on top of the dual .50 M2 Browning">M2 Browning machine guns)
The Mk 18 Mod 0 was a 40x46mm grenade launcher used by the United States Navy during the Vietnam Wa ...
References
Mk20 Mod 0
{{Blow forward firearms
Blow forward firearms
Automatic grenade launchers
40×46mm grenade launchers
Autocannon
Machine guns of the United States
40 mm artillery
Military equipment introduced in the 1960s