Head, torso: Firefly
Arms: MARs Trooper
Hands: MARs Trooper
Upper legs: Heavy Duty
Lower legs: Destro

Gallows was a Cobra SAW Viper that showed a great deal of ability, firing with extreme accuracy, precision, and rapidity. He has been outfitted with the latest state of the art body armor and weapons systems. He lays waste to all that stand before him, living or undead.

Gallows walks the wastes eradicating undead and any survivor dumb enough to deny him what he wants.
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This figure started out as a different figure, I'm still not totally sold on it being Gallows but haven't come up with anything else.