An Amherst man was charged with unlawful possession of a machine gun after a maintenance worker conducting a routine inspection of the man's apartment noticed a number of firearms out in plain view, according to the U.S. Attorney's Office.
Prosecutors said 22-year-old Rejjie Ni was additionally charged with unlawful possession of an unregistered machine gun.
Amherst police were called to Ni's Herron Drive apartment on March 18, after the apartment building manager notified police, prosecutors said.
Ni allowed police into the apartment, where officers discovered numerous rifles, boxes of ammunition, magazines and an apparent rifle box with a shipping address from Texas mailed directly to Ni in New York State.
A search warrant was obtained, after which police recovered 33 rifles, two shotguns and numerous rounds of ammunition, prosecutors said.
Ni allegedly converted at least one of the recovered firearms into an illegal machine gun.
Ni was held in custody following a detention hearing Tuesday.