Head: Heavy Duty
Rest: Roadblock
When you just absolutely, positively, must totally destroy everything, you call in the heavy machine gunner. Undead horde at the gates? Heavy machine gunner. Gang of marauders storming the castle? Heavy machine gunner. He's best at eliminating large groups of hostile threats.
Gunner carries the big guns, literally.
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I prefer building teams in 3-5 and this guy rounded out the crew.