There is no way actors are responsible on set for firearms and their condition. This isn't a shooting range. The industry has rules and regulations. And safety protocols. And actors clearing weapons I am sure is not one of them. Again its like saying an actor is suppose to make sure the breaks are ok on a vehicle, or do a background check on everyone who's working on the set. The industry has run in a certain way for literally generations dealing with guns. Actors, checking and clearing weapons isn't in the protocols. Thats why they hire experts on these sets. They most likely are not even permitted to do any such thing.