Shouldn't that be manufactured and/or stored? What about guns legally imported into the state but later declared illegal by the feds?
They have to keep everything contained within the state so that the Commerce Clause cannot be cited as the Constitutional authority for the feds to be involved.
No. The argument is that a gun manufactured, sold, and owned in Kansas does not qualify as interstate commerce and therefore the federal government cannot regulate it, i.e. pass laws controlling them. A gun manufactured in one state and sold in another does.