Police busted a man who pointed a loaded gun at a straphanger on the subway early Sunday morning in Brooklyn, authorities said.

“Get away from me,” Omar Lopez, 36, told the man after they began arguing around 5 a.m. aboard a moving northbound N-train in Sunset Park.

The victim, who was not cooperative with police, called 911 after the incident.

When the train pulled into 59th Street Station near 4th Avenue, the doors remained closed until officers could sweep the train.

They found the loaded .32-caliber gun inside Lopez’s jacket, police said.

Lopez was arrested at the train station and charged with criminal possession of a firearm and menacing. This is his first arrest, police said.