That sucks that New York is so strict on guns and you can't really do anything awesome with them. I know Virginia is pretty loose on guns so I really hope you can become a Virginia resident soon so you can actually put a muzzle break on the AR. I'm not sure if Virginia will let you put a folding stock on it, but where I live which is in South Carolina, I am 100% certain you can own almost any type of gun if you could ever want to. So you can put a folding stock on an assault rifle.
I love that 870. The AR looks nice too, except for the lack of a folding stock. I really hope you have a muzzle break on it by now too because that would make it 20x sexier.