1. Short title This Act may be cited as the National Firearms Amendments Act of 2019 . 2. Semiautomatic rifle with capacity to accept detachable magazine treated as firearm under National Firearms Act (a) In general Section 5845(a) of the Internal Revenue Code of 1986 is amended— (1) by striking ; and (8) a destructive device. and inserting ; (8) a destructive device