M319 grenade launcher

The Unidentified Grenade Launcher is a single-shot explosives launcher in use by the United Nations Space Command during the Human-Covenant War. It was used during the Battle of Reach.

Trivia

 * It appears to be roughly based off of the M79 grenade launcher, a weapon used throughout the Vietnam War. This is due to its single-shot break-action configuration.
 * The grenade launcher actually have two fire modes.