A simple way to get around such trick is to sell the NY purchased gun to an out of stater and buy one for cash. Ends the paper trail and the NCIS registration fails. For that matter sell it and buy it back for cash.
What you are also forgetting is the sheer number of those who are refusing to register them. There are not enough police nor prisons to handle that many people.
I don’t register or ask permission for anything. Let them track me. My goober peas and jolly ranchers don’t go without a fight.