One of New York City's most notorious and prolific ghost gun traffickers is in custody, prosecutors claimed Tuesday. Martin Streich, 21, allegedly used a 3D printer to create guns, including at least one gun that was used in at least eight shootings in Jersey City, according to the Staten Island District Attorney's Office. An undercover officer helped crack the case by buying eight weapons from Streich, the NYPD said. Those weapons included two AR-15-style rifles and six handguns.