You should go to a gun shop in New York state or call them and send a photo and description. They are quite familiar with what is legal to possess and sell. A lawyer will not necessarily have the definitive answer to this technical question.
The law has just become tighter for assault weapons in New York State. One of the things that has become tighter is buying assault weapons over the internet. You need to discuss this with a NY gun dealer to see if the weapon you are talking about is legal to buy over the internet to begin with.
If this answer was helpful please click that block. Answers in the forum are only general and it is always best to contact a criminal defense lawyer to discuss your case. Bukh Law Firm P.C., 14 Wall Street, New York NY 10005, (212) 729-1632. www.nycriminallawyer.com