Can you carry a airsoft BB gun in Florida if you are under 18?

I am asking this because I am going as a Marine for halloween (I am 15) and I was wondering if I could carry a m16 or Shotgun type of BB gun and a pistol (in holster)?? Can I carry it without the BBs in it?? Will I be stopped and questioned about the BB guns by Law Enforcement??? MY costume isn't a shirt and face paint..I am looking like a real Marine minus the height but I am getting like the pants,goggles,helmet,ETC...!!!