I have seen, in several states, a guard with a revolver and no additional ammunition. He is, by definition, an armed guard. He is not responsible for anything but killing someone threatening lethal force against others. He is not there to arrest people, to confront anyone, or to enforce any law or policy. He is there to kill.
So, he doesn't need handcuffs. Or pepper spray. Or anything else, except 6 bullets in the revolver.