An outspoken Long Island gun owner’s home was raided by Nassau County detectives, who seized two dozen weapons he lawfully owns just one day after Rep. Carolyn McCarthy’s office made a 911 call about him.

Freeport resident Gabriel Razzano claims he was targeted in the spring raid for his “unpopular” political beliefs.

He’s now filed a $5 million federal lawsuit against the Nassau PD and McCarthy, charging they joined forces to strip him of his guns unconstitutionally.

The case pits Razzano against McCarthy, the most outspoken gun-control advocate in Congress. A crazed gunman murdered her husband in the infamous 1993 Long Island Rail Road Massacre.

The flap arose on March 19, when Razzano visited McCarthy’s Garden City office to discuss an article about an illegal immigrant who was deported but was later nabbed in Freeport for the attempted murder of a cop.

“The office staff felt that Razzano’s behavior was disruptive and threatening,” said Lt. Kevin Smith, a police spokesman.

Razzano’s home was raided the next morning.

philip.messing@nypost.com