The guns were a lot of fun to make, thinking out of the box as I don't have access to giant chain guns for recording. I used a washing machine, that was duplicated several times, each copy pitch shifted significantly. I then added an auto-pan cranked up to help simulate the rotating/spinning of the chaingun. I then used a snare sample and a gunshot, blended over the top to complete the sound. This process was used for all the ballistic weapons.