Jonathan Jamison of Flemington is charged with possession of an imitation firearm for unlawful purpose and possession of a firearm for unlawful purpose.
Authorities say the 19-year-old was spotted acting suspiciously with a mask and gun near Exxon Research on Route 31 in Clinton Township on Tuesday. Exxon security guards told police the man was in a vehicle across from North Hunterdon High School.
Police recovered what appeared to be an M-16 rifle that turned out to be an imitation equipped with a real silencer and scope.
Police locked down Clinton Township schools, North Hunterdon High School and Immaculate Conception School as a precaution.
