Automatic Monkey said:
When you're dealing with armed robbers with fully automatic weapons, you're usually talking about a MAC-10 or some kind of machine pistol. In this case it probably doesn't make any sense to bring a functioning full-auto weapon, because if things degrade to the point where he actually has to fire the weapon, he's in such deep trouble that he doesn't need the extra 10 years in the Federal pen for the full auto.