While the bill seems to focus solely on federal gun regulations, it has far more to do with the 10th Amendment’s limit on the power of the federal government. It specifically states:

The regulation of intrastate commerce is vested in the states under the 9th and 10th Amendments to the Constitution of the United States, particularly if not expressly preempted by federal law. Congress has not expressly preempted state regulation of intrastate commerce pertaining to the manufacture on an intrastate basis of firearms, firearms accessories, and ammunition.

Rohrer, in a recent letter to Pennsylvania House Members, addressed the issue of the commerce clause...Read more here