I remember seeing in a book that wen terminator was holding a minigun,he had to wear bullet proof armour because the shell casings were so dangerous,and i think it had a hidden tripod or something to hold it cos even the blanks it fired were too much for a man to hold the gun and not be thrown off his feet.
You could have a couple of bull-pup style weppens like that FAMAS, and a laser gun,wich do actually exist,