Another case of the fluff description writer not really paying attention to RAW. As a GM in a home game, I'd easily allow a weapon mount on it, but missions I probably wouldn't. Then again, I really think there should be another category of weapon mounts. Rather than just Normal and Reinforced, I think there should be Light, Normal, and Reinforced (SMG, LMG, Anything respectively).
I miss the SR3 days of strapping heavy pistols onto Gaz Nikis.