The case is MONTANA SHOOTING SPORTS V. ERIC HOLDER, JR.
A case brought by Gary Marbut. The case was filed shortly after Montana enacted its Firearms Freedom Act (MFFA), a legislative action that several States have enacted in order to confront and limit the Commerce Clause used by the Congress.
At district court, the case was dismissed on issues of standing and for failure to state a claim. The Circuit court affirmed the lower court, insofar as the failure to state a claim, and that the MFFA was preempted by federal law (Supremacy Clause of the US Constitution).