N.Y. Penal Law § 265.55

§ 265.55 Criminal possession of an undetectable firearm, rifle or\n shotgun.\n A person is guilty of criminal possession of an undetectable firearm,\nrifle or shotgun when he or she knowingly possesses:\n 1. any firearm, rifle or shotgun that, after the removal of grips,\nstocks and magazines, is not detectable by a metal detector calibrated\nto detect the Security Exemplar, as defined pursuant to 18 U.S.C. §\n922(p); or\n 2. any major component of a firearm, rifle or shotgun that, if subject\nto the types of detection devices commonly used at airports for security\nscreening, does not generate an image that adequately displays the shape\nof the component.\n Criminal possession of an undetectable firearm, rifle or shotgun is a\nclass E felony.\n