# US Supreme Court firearm litigation > Developing situation record from CLSTR: https://clstr.news/situations/us-supreme-court-firearm-litigation > Updated: 2026-10-29T14:39:57.000Z. Sources: 7. Developments: 2. The U.S. Supreme Court is facing legal challenges from both sides of the firearm debate. Gun rights organizations, including the NRA and the Second Amendment Foundation, have petitioned the Court to dismiss a lawsuit against firearms manufacturers. This case, Daniel Defense v. Lowy, involves allegations that advertisements depicting a “warrior mentality” deceptively marketed firearms to young males, contributing to a 2022 shooting in Washington, D.C. The manufacturers seek to resolve a circuit split regarding the necessity of proving a defendant's conduct had a “determinative or coercive effect” on a third party to establish liability. Simultaneously, gun control groups such as Americans Against Gun Violence and the American Enlightenment Project have submitted briefs requesting the reversal of the 2008 Heller v. District of Columbia decision. These advocates argue the ruling is incompatible with the Second Amendment and has caused public health consequences. The Court is also preparing to review the constitutionality of bans on modern semiautomatic firearms in Illinois and Connecticut, with advocates using metrics like “Muzzle Energy per Minute” to argue for the disproportionate lethality of such weapons. ## Timeline ### 2026-10-29: Gun control groups petition Supreme Court to overturn Heller ruling Gun control groups are urging the U.S. Supreme Court to overturn the Heller decision during upcoming cases regarding semiautomatic firearm bans in Illinois and Connecticut. 7 sources. https://clstr.news/cluster/gun-control-groups-petition-supreme-court-to-overturn-heller-ruling ### 2026-09-30: Gun rights groups urge Supreme Court to dismiss firearm advertising lawsuit Gun rights groups are urging the Supreme Court to dismiss a lawsuit that seeks to hold firearm manufacturers liable for advertisements allegedly used to inspire a 2022 shooting in Washington, D.C. 2 sources. https://clstr.news/cluster/gun-rights-groups-urge-supreme-court-to-dismiss-firearm-advertising-lawsuit --- Cite as: US Supreme Court firearm litigation. CLSTR, https://clstr.news/situations/us-supreme-court-firearm-litigation