I dont know about gun laws there in NY, but i know it CAN be put on it. I had one for my ar15. Check your local laws. I dont know a thing about NY laws except that they are very strict (i'm sure you know that a lot better than i do). Sorry i cant be of much help.
"Nothing is more destructive of respect for the government and the law of the land than passing laws which cannot be enforced." - Albert Einstein
How is LI. I grew up there! We would pack our .22's in the car and shoot NRA smallbore at Island Trees HS and the Nassau county complex. The sight/scope will not make it illegal, mags are a different story.
Freedom is not free. The best of us always leave too soon.