A controversial Brooklyn judge who flashed a firearm during a hearing has been demoted, had his pay slashed — and is now banned from lugging the gun into the courtroom, according to sources.

Acting Brooklyn Supreme Court Judge Jeffrey Gershuny — who was exposed by The Post for pulling out his gun during an Aug. 5 court hearing — will now only be allowed to hear misdemeanor cases in criminal court, sources said.

That means his salary will be slashed by approximately $16,000, or about 7%, as the standard annual pay for Supreme Court justices, who hear felony cases, is $232,600, compared to $216,400 for those on the criminal court bench, according to sources.

Judge Jeffrey Gershuny got into hot water after pulling out a gun during an Aug. 5 hearing in Brooklyn Supreme Court. Christina

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