New Jersey classifies commonly owned semi-automatic .22 rifles as "assault firearms." New Jersey imposes a 10-year prison sentence with a minimum mandatory three to five years, even if the gun owner had a New Jersey Firearms Purchaser Identification Card and the .22 was lawfully purchased prior to the ban. New Jersey classifies both antique revolving cylinder shotguns and semi-automatic BB guns as "assault firearms." New Jersey imposes a 10-year prison sentence with a minimum mandatory three to five years, even if the gun owner had a New Jersey Firearms Purchaser Identification Card and the antique shotgun or BB gun was lawfully purchased prior to the ban.
Source
http://www.pgnh.org/count_your_blessings_new_jersey_shows_how_bad_gun_laws_can_be