Twin Barrel

The Twin Barrel Shotgun, also known as the double barreled shotgun or the double rifle, was a shotgun that was originally used for Hunting.

Details
Although twin barrels were invented around the 17th century, they didn't reach high demand until around the 19th century for hunting purposes, to which it still is primarily used.

During the Peace Walker Incident in Costa Rica in 1974, Big Boss and his mercenary group, the Militaires Sans Frontieres, managed to find design specs for the double barreled shotgun within Banana Fruta de Oro's sorting shed. The R&D Team of the Militaires Sans Frontieres eventually modified it by reducing it to a sawed off double barrel shotgun making it easier to handle, as well as increasing its reload speed. The Militaires Sans Frontieres managed to also find design specs for another variation of the Twin Barrel Shotgun, this one firing rubber slugs to knock enemies out rather than killing them, after neutralizing an enemy unit at the Los Cantos Canyon. Similar to its cousin, the Rubber-slug Twin Barrel Shotgun's reload speed was increased under the R&D Team.

The South American rebel soldiers during their revolution against the current regime, utilized sawed off Twin Barrel Shotguns.