As in: If a PC is using his firearm in a melee with a stunned NPC, does he get the +3 for attacking an immobile target? Couldn' t find an answer to THIS specific question and in my interpretation, both ways seem plausibel, like: The NPC could be simply not moving, but he could also be thrashing around and still making it difficult for the PC to aim.
Bear in mind there is negative modifier to hit prone targets.
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