M79 grenade launcher

The M79 Grenade Launcher was a grenade launcher that's famous for its distinctive shape, resembling a sawed-off shotgun.

Usage
It was first developed during the 1960s as a result of Project Niblick. It was formally adopted in December 15th, 1960, and the first models were delivered in 1961. It eventually saw use in the Vietnam War and the Falklands War, although it was replaced for the most part by the M203 by the end of the Vietnam War (it still saw use with the National Guard and the Reserves, however.).

The soldier nation Outer Heaven used the M79 Grenade Launcher, presumably for combat purposes. During the Outer Heaven Uprising, Solid Snake procured one of the M79 Grenade Launchers and made use of it by destroying a Hind D and a Bull Tank.

Post-Outer Heaven
The M79 later saw action during the War of Iraq.