M319 grenade launcher
From Halopedia, the Halo wiki
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The Unidentified Grenade Launcher was a single-shot explosives launcher in use by the UNSC during the Human-Covenant War, specifically during the Battle of Reach. It will be appearing in the upcoming game Halo: Reach.[1]
Trivia
-It appears to be roughly based off of the american M-79 grenade launcher, a weapon used throughout the Vietnam War. This is due to its single-shot break-action configuration.
