The U.S. Department of Justice has opened a new front in the national fight over firearms regulation, filing suit on July 1 against California to block enforcement of the state’s newly enacted “Glock Ban” and to challenge the California Handgun Roster under the Second Amendment. The case is notable not just for its subject matter, but for the posture: the federal government is now directly attacking one of the country’s most developed state-level handgun regulatory systems.

At a high level, the lawsuit appears aimed at two pillars of California firearms law.