If every person who had the skills and tooling to hand build machine guns (which was the topic) I think that would have a substantial effect on Congress' ability to regulate the interstate commerce of machine guns.
Don't you?
Don't you?
The only affect it would have on Congress' ability to regulate interstate commerce would be to help provide the final check on their ability to abuse that power.
It sure would, but as it turns out, simple machine guns can be made with just hand tools. The only difficult part is the barrel and to some extent the bolt.
That fact interferes with Congress ability to regulate interstate commernce in machine guns it's true. But they are prohibited from exercising that ability anyway. Or do you maintain that the Second Amendment doesn't apply to acts of Congress?