Called the “Thumper” due to the sound of the airburst rounds and its frequent use as a bludgeon by downed pilots, the Barghosa Multi-function Compact Assault Rifle model 78 is a rugged Bullpup styled rifle that fires caseless ammunition. Three of these weapons were either loaded aboard the Hemera U-238 or were part of the U-238 survival kit.

The MCAR-78 features a laser sight, iron sights mounted on top of the electronics package, and dual-function triggers. The weapon is capable of firing a variety of rounds – explosive (programmable air-burst or touched off by the second trigger), reconnaissance (wee little cameras, primary use of the display screen after ammunition count), armor-piercing and anti-personnel. Caseless ammunition gives the MCAR-78 high long-range accuracy and stopping power at the expense of a rate of fire much lower than comparable hardware.

Though not used to its full capacity in Dead City Radio, the weapon is equivalent to a lower caliber US Army XM25. The MCAR-78 is durable, well-built and designed for a long shelf life followed by frequent, abusive use without cleaning or maintenance.