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.
SCOTUS directed the 9th Circuit to reconsider Stewart and be guided in that reconsideration by Raich. The result:
"We therefore hold that Congress had a rational basis for concluding that in the aggregate, possession of homemade machineguns could substantially affect interstate commerce in machineguns."
The findings in Wickard, Lopez, Stewart all point to an
unenunciated Federal power to elevate private posession of anything to an act of interstate commerce. I am trying to
think of something that the Feds could not by fiat promote
possession of to a Federally regulated act were they of a mind to.