From World Net Daily:

The expected decision now clears the way for a battle that could end up in the U.S. Supreme Court over state sovereignty, alleged regulatory overreach, the right to self-defense and even the compact under which Montana became a state.

The Montana Firearms Freedom Act was enacted in Montana and signed into law by Gov. Brian Schweitzer in 2009.

It declares that a firearm made and retained in Montana is not subject to any federal regulation under the power given to Congress in the U.S. Constitution to “regulate commerce … among the states.”