Linebacker G-87 MSGL

The Linebacker G-87 MSGL (Multiple Shot Grenade Launcher) is a weapon in Deus Ex: Human Revolution.

Background
The Linebacker G-87 MSGL is a semi-automatic grenade launcher developed by Steiner-Bisley GmbH. It fires low velocity 40mm grenades, each of which are loaded with a high explosive fragmentation charge. The weapon uses a unique horizontally-mounted loading system. The magazine is mounted above the barrel.

Characteristics
The grenades are pushed forward by spring pressure and arrive at the end of the magazine, then are fed as a single row into a spiral feed ramp and rotated 90 degrees, aligning with the chamber. The magazine can hold 6 grenades despite the fact that it seems to carry more than 6 rounds.

Trivia

 * The Linebacker MSGL appears in the reveal trailer for Deus Ex: Mankind Divided, being deployed against Adam Jensen by the leader of a pro-augmentation terrorist group near the end of the teaser.
 * According to the trailer, the Linebacker, or at least in the upcoming game, fires airburst grenades that explodes in midair and unleashing a cloud of metal ball bearings when close to the intended target. This hints at the weapon being equipped with a rangefinding-smart munition system.
 * The Linebacker MSGL's magazine and feed system were likely inspired by the FN P90.