200 is a much smaller amount than people think. The standard combat load (what you walk around with) for someone with an M4 is 210 rounds.  
  
One person could fire that many in 35 seconds. (Low end rof of 700 rpm/200 rounds + 3 seconds to load the 6 extra magazines).  
  
Give a man 5 big Mac's and 200 rounds, he could get through the rounds quicker (though indigestion may be an issue)