The law was recently amended for weapons that contain a certain amount of bullets with an extended cartridge holder.
A magazine that can hold over the legal amount of bullets can subject you to a felony status of possession of an assault weapon.
The definition of an assault weapon has been broadened.
People that purchased an assault weapon before the law went into effect could have grandfather status with that weapon.
In order to see the grandfather status, they have to consult with and contact their local state police barracks and fill out a waiver and paperwork that registers the weapon with the state.