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Description:
{{US|_|Army|and|Marines|military|slang}} Any weapon firing a 40mm grenade. Often specifically the M203 grenade launcher whether mounted underneath an M-16 or variant. Often in the Marine Corps, the "40 Mike-Mike" is slang for the '''Mark-19 Automatic 40mm Grenade Launcher'''.
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40 mike-mike
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Wiktionary
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