1 definition by EveryMnwee

Top Definition
40mm (not 20) grenade-launching machine gun. Capable of firing 350rpm (not 9) in the current Mod 3 version.

Used by all branches of the US military, with the first prototypes being tested in the Kennedy-era and the newer Mod 3 entering active use by the Gulf War in 1991.
The Ranger fired his MK-19 into every Somali window he passed while riding with his convoy.
by EveryMnwee November 15, 2007

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