Real guns may still be used in some compacity for technical/budget reasons for a scene.
My guess is that whoever was in charge of providing the prop made a mistake and left live ammo.
The burden will probably fall on whoever is managing the props before they reach the actor.
Now, if this were someone like Keanu Reeves, I bet the bar would be significantly higher.
Dude might legit know how to clear a home at this point.
Cosign on the bold. Funnily enough I saw this vid a couple of weeks ago and watch the first 15 secs...
Sidebar: Overall channel is cool if you like hearing movie facts in general