The 10th Circuit Court of Appeals in Denver heard oral arguments on Wednesday in a case challenging the federal government’s ban on bump stocks. The lawsuit involves complex-sounding legal principles like the Chevron doctrine and the rule of lenity, but the plaintiff who has brought the case is seeking an answer to a more simple question: Did the Bureau of Alcohol, Tobacco, Firearms and Explosives act within its authority when it banned bump stocks, or does a ban require a law change by Congress to be valid?

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