Top Definition
M6D
The M6D Assault Pistol is a recoil-operated, magazine-fed handgun. It is issued with a smart-linked scope capable of 2X magnification. It fires 12.7mm semi-armor-piercing, high-explosive rounds. It can shoot either semi-automatic or automatic fire.
Pvt. Valdez pumped a full clip into the helpless Grunt.
by Militant Liberal April 16, 2005

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M6D
The specific name of the model of sidearm used by the UNSC.
Pvt. Valdez pumped a full clip into the Grunt with his M6D.
by Militant Liberal April 05, 2005

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M6D
Some fake ass gun in Halo.
I googled M6D and all I found was weak ass gamer sites.
by bt42 January 08, 2009

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