Guns used on film sets are real guns. They're simply loaded with blanks. Basically every movie and television show you've ever seen involved people breaking the "safety rules" of firearms. Every time you see a gun pointed at "you," i.e. the camera, an actor is pointing a real gun at a cameraperson who is holding the camera, which is precisely what happened here.
When you see people "shooting" at each other, they're firing real guns loaded with blanks at each other. You can certainly remove all realistic gunplay from movies and TV, and I'm fine with that, but it's absurd to think that the same rules of firearm safety apply equally in the context of filmmaking.