Something unusual is happening at One First Street in Washington, D.C. The U.S. Supreme Court has been holding several major "hardware-ban" cases on its conference docket for months — refusing to either accept them for full review or turn them away. For gun rights advocates, constitutional law scholars, and millions of Americans living under state-level AR-15 bans, the silence is anything but quiet. It's the loudest signal the Court has sent on the Second Amendment since Bruen. What Is a …