So it could be a crime if one of the jury presses the issue (specifically, pointing a gun at someone in a manner to intimidate them would be Assault with a Deadly Weapon, regardless of if the "weapon" was actually loaded, operable, or even a realistic toy. So long as the victim believes it was a real gun, it's Assault with Deadly. Given that it was done to 12 members of the jury, it can be Jury Intimidation or similar crimes). In all likelihood, the Prosecutor's office will likely exercise prosecutorial discretion and not bring charges for various reasons (If you want something innocuous, given the context of the situation, it might be harder to prove. If you want something more corrupt, Binger is the prosecutor... he and his office would likely not charge one of their own.).
The other recourse would be to file a complaint with the Bar Association which could result in Binger receiving fines, suspensions, or even disbarment. Given other problems with Binger's behavior in the trial, he could easily be facing Bar Association complaints as some of his behavior is highly questionable to downright unethical (Questioning Rittenhouse's invocation of the 5th to the police in front of a jury, introducing evidence the judge ruled inadmissible, questioning another witness's invocation of his sixth amendment right to counsel in front of the jury, and accusations of violating Brady disclosure rules). In all likelihood this is another log on the fire in any complaint to the Bar Association.
As stated in other comments, Binger at the least shows very very poor gun safety. You never treat a gun as if it was unloaded unless you checked yourself... and even then some experts advise under no exceptions just to be extra safe.
