In Chaos you purchase armor that has built-in weapons, so you cans see that his hands fit underneath the weapon, and he has a chord the connects from the back of his head to his weapon, functioning as a targeting system for the three barrel carbine rifle attached to his hand/arm
Side eye? explain please..
i took this concept off of the shape of the battle suit, as you can see the chest/head/feet are all inspired by the tremulous battlesuit