https://www.ca10.uscourts.gov/opinions/17/17-3034.pdfThis is a tale of two laws: the National Firearms Act (NFA), 26 U.S.C.
§§ 5801–5872, which requires the registration of statutorily defined firearms, and Kansas’s Second Amendment Protection Act (SAPA), ch. 100, 2013 Kan. Sess. Laws vol. 1 500–03 (codified at Kan. Stat. Ann. §§ 50-1201 to -1211 (2014)), which purports to exempt any personal firearm, firearm accessory, or ammunition manufactured, owned, and remaining within Kansas’s borders from “any federal
law, . . . including any federal firearm or ammunition registration program, under the authority of congress to regulate interstate commerce.” Kan. Stat. Ann. § 50-1204(a). In 2014, these two laws intersected when the government prosecuted two Kansas men, Shane Cox and Jeremy Kettler, for violating the NFA by manufacturing (in Kansas), transferring (in Kansas), and possessing (in Kansas) several unregistered firearms. A jury found them guilty of most (though not all) of the charges.