First off, depending on what you want, it's physically impossible. Second off, i could just get you two six-barreled M134 miniguns and load them with armor piercing incendiary rounds. They'd be easily mountable.
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Btw im 9 feet tall and i have arms the size of 3 miniguns combined. Nevermind though ill make my own.
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In that case, we could do two M61 Vulcan 6-barreled rotary cannons. They fire 20mm HEI shells
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I will take those. What is your price?
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For both, i'd say $750,500
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*hands you $800,000* Keep the rest. Im not gonna need it.
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I'll need you to head to Edgewater for fitting.
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Ok. *walks towards Edgewater carrying a cannon on each shoulder*