Police found a gun, bullets and two bulletproof vests when they searched Mack’s home last week.
The Grays Farm man and his girlfriend recently appeared before Chief Magistrate Joanne Walsh facing several offences.
Mack pleaded guilty to illegal possession of a 9mm pistol, 13 rounds of 9mm ammunition and 22 rounds of .45 ammunition.
He also admitted to illegally obtaining two ballistic vests belonging the Royal Police Force of Antigua & Barbuda.
Prosecutors withdrew the charges against his girlfriend, who pleaded not guilty.
The defendant’s lawyer Lawrence Daniel says a package containing the items washed into his client’s yard during flash floods last November.
Protesters outside NYC s Gracie Mansion demand jail reforms nydailynews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from nydailynews.com Daily Mail and Mail on Sunday newspapers.
Gracie Mansion protesters demand Rikers Island reforms, justice for NYC jail prisoners during Human Rights Week march Nicholas Williams, Dave Goldiner
Dozens of protesters marched on Gracie Mansion Saturday to demand the speedy closure of Rikers Island and justice for incarcerated victims of brutality behind bars.
More than 50 activists and ex-inmates called on Mayor de Blasio to improve conditions at Rikers and end what they called a history of abuse.
“Rikers is a human rights crisis,” said organizer Darren Mack of Freedom Agenda NYC. “We are here today standing with family members of people who had died on Rikers. We are here today with survivors of Rikers Island.”