I am really glad to see this decision. I always enjoy seeing the commerce clause limited to something that might someday approach a sane limitation on it. The specifics of the case seem to indicate there will be a market for components to build one's own machine gun machining those parts necessary for the final product. Of course we will have leechocrats debating like medevil theologians just where the limit of home manufacture ends and interstate commerce begins. (How many angels can dance on the head of a pin. What we do need is one SCOTUS ruling that the Second clear states an individual right. Such along with the commerce clause would do much to halt the Federal encroachment on individual liberties.
In short I applaud any ruling that limits the Commerce Clause authority or upholds teh individual right to keep and bear arms.