Arasaka WCCA "Susano-0" Grenade Rifle

Multiple-shot grenade launchers have been available for decades, but they all have some problem or another-most of them are rotary cylinder designs, which suffer from accumulations of environmental crud in their cylinders. What's more, any revolver has pressure fall-off because of the breach between cylinder and barrel. Militech solved this problem by using a sealed drum in the US. Army's M-212.

Still, Arasaka's special forces didn't want to mess with the fussiness and bulk of such designs, and went ahead with their own weapon: a blocky, pepperbox-style grenade launcher named after the mischievous Japanese god of thunder. The all- ceramic construction of this nine barreled troublemaker keeps it exceptionally lightweight (2.5kg unloaded), utterly reliable, and easy to handle.

The three-by-three layout of the WCCA's barrel array allows any number of barrels to be fired at once, with sequences and load combinations programmed into the weapon's microchip (Smartchipping allows direct neural control of this feature). However, firing all nine barrels at once could injure the firer and will definitely destroy the weapon ... but that's OK, since once all 9 shells have been launched, the weapon's totally disposable.

Reference

 * Firestorm Shockwave (pg. 32)