We all know he is a weapon specialist, he can use from small pistol to heavy machine gun. But based on our research we found out that he did not have a unique weapon that can surprise that audiences enough.
We came up with an idea why not build a heavy weapon that rarely seen. After more research we decide to design a 3 barrel machine gun with a cannon at the center, we have all seen machine gun, but never a cannon. Therefore, we made this weapon with cannon and machine gun mode, or Rocket can turn on both so he can shoot while firing