No / there are 3 areas into which Commerce clause power extends:
(1)    the use of channels of interstate commerce[Darby;Heart of Atlanta Motel]
(2)    the instrumentalities of interstate commerce or persons or things in
interstate commerce, even though the threat may come from intrastate
commerce[Perez] and
(3)    substantial relation to interstate commerce. [Jones & Laughlin]
This case turns on the 3rd area. Guns in schools does not have a substantial
effect on interstate commerce.
The Act in this case is a criminal statute that has nothing to do with commerce.
Dismisses govt argument that it substantially affects interstate commerce because
it might result in violent crime, increasing insurance rates. And second, disrupt
educational process, less productive society. But if this is adapted, there would
not be any limitation on Fed power.