atf made a "rule" to make a certain firearm component illegal... they did this just by saying they decided to do it, after years of it being allowed and to the letter of the law, was legal. seeing as this was the a bureaucratic decision from the executive branch making a "law" that directly contradicted the actual law as written and passed by congress (and prior decisions not to go after them) the court said they can't do that. this is the atf saying "we don't care you said we can't we're doing it anyway."   > forensic examination of a recovered projectile, matched to gun that fired it. that doesn't really work, they can typically just get the model of firearm at best nowadays because of mass production and swappable barrels. it's just bullshit to scare people into thinking they can actually do that on a mass produced firearms.
United States