I also live in NY and i have the black line on the top of the follower. I am going to buy a 25 round magazine and take it to the range. THey cant see that it has 25 and i doubt they will care as long as i fire slow and not rapid fire all of the 25 at once.
I also was going to ask my grandpa for a nut and bolt to put through the follower to make it easier to pull it down which i think will work just fine. Whats the point of spending 27 dollars to convert it if i can just buy a new 25 round one for 20 bucks and put a not and bolt in the 10 rd one.
-Anthony