Howdy all..first post.You are not even allowed to make the AR15 lower in NYS: This little law covers 80% lowers
or the idea of making a magazine with a 3d printer
S 265.10 Manufacture, transport, disposition and defacement of weapons and dangerous instruments and appliances. 1. Any person who manufactures or causes to be manufactured any machine-gun, assault weapon, large capacity ammunition feeding device or disguised gun is guilty of a class D felony. Any person who manufactures or causes to be manufactured any switchblade knife, gravity knife, pilum ballistic knife, metal knuckle knife, billy, blackjack, bludgeon, metal knuckles, Kung Fu star, chuka stick, sandbag, sandclub or slungshot is guilty of a class A misdemeanor.
I'd also be careful with the idea of thinking you are not in violation if you have the parts but not put them together. They have this neat little law called "constructive possession" Which I fear they can warp into meaning if you have the parts under your domain, you can easily put them together and have an illegal weapon.
I'm not a lawyer