HELENA - Montana Attorney General Austin Knudsen and 23 other states filed a lawsuit against an egregious and overreaching Biden administration gun control regulation that will turn millions of gun owners into felons if they do not register certain devices they lawfully own with the federal government and pay a tax.

The lawsuit filed in the U.S. District Court for the District of North Dakota Western Division against U.S. Attorney General Merrick Garland, the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives and its director that seeks to enjoin a recently issued final rule governing "S...