But that possession affects interstate commerce, and such a recitation must appear in the federal law that prohibits handguns w/in XX feet of a school. The Lopez decision was gutted months after its passage. It's holding is facile.
I believe you are mistaken. Lopez was cited in United States v. Stewart, where the 9th circuit held that homemade machine-guns did not fall under jurisdiction of the Federal government because they were not involved in interstate commerce.