For the grenade launcher, the concept of the gun was supposed to be a more volatile-looking design, as if the gun were simply a dangerous prototype.  I decided the best way to convey this design decision by the other group members was to make it appear as if the inner workings of the gun were somewhat exposed to the eye, as if the prototype was just barely in the testing phase without any regard to how the final product would look. I also decided to go with a heavy emphasis on corrosion, damage, and edge wear around the more exposed metals of the gun when deciding on the generators to use, to convey the idea that the prototype had been locked away and forgotten about for a long time by its creators.
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​concept art by John Emerich