The Supreme Court of the United States will hear oral arguments Tuesday in VanDerStock v. Garland, a case focused on the ATF’s unilateral action to redefine what constitutes a “firearm.” The case revolves around ATF Final Rule 2021-05F, which placed new controls on gun parts kits and firearms which Democrats describe as “ghost guns.” A central part of this rule was redefining what the word “firearm” meant so as to designate “partially completed pistol frames” and other gun parts as “firearms.” The ATF observed: "Partially complete Polymer80, Lone Wolf, and similar pistol frames with any kind of indexing or material...