It doesn’t matter what is or isn’t in the episode, it’s impossible to imagine parks built on the possibility of violence where the only safeguard for the guests is some kind of magic gun technology that stops them from hurting humans, and then further apply that explanation to just about any other kind of weapon.
How do you prevent human-on-human violence, accidental or otherwise? It’s implied the guests often don’t know if they’re dealing with hosts or other guests, and even if they could identify humans and never tried to hurt them, how do you put something like a bow and arrow in the hands of a guest and prevent the eventual accidents?
The “smart” guns that fire harmless ammo at humans is a barely believable explanation on its own, and you just can’t extrapolate that out to other weapons with even a shred of plausibility. This was brought up with things like knives and explosives in season one, and there is no satisfactory answer. It’s just magic you ignore.