Cap guns are illegal.

Picture thanks to: skand

TITLE 11
Criminal Offenses
CHAPTER 11-13
Explosives and Fireworks
SECTION 11-13-4

§ 11-13-4 Toy canes or devices for firing blanks. No person or persons shall sell, expose for sale, possess with intent to sell or use, or discharge or use, within this state, any repeating toy cane for discharging any explosive, any toy pistol, or any other toy device designed or used for the discharge of blank cartridges.