; (F) the firearm or ammunition is being imported or brought in for the purpose of exportation; (G) the firearm or ammunition was previously taken out of the United States or a possession thereof by the person who is bringing in the firearm or ammunition; or (H) the firearm is a firearm defined as curio or relic by the Attorney General under section 921(a)(13) of this title. (2) Within 30 days after the Attorney General receives an application therefor, the Attorney General shall permit the conditional importation or bringing in of a firearm or ammunition for examination and testing in connection with the making of a determination as to whether the importation or bringing in of the firearm or ammunition will be allowed under this subsection. (3) The Attorney General shall not authorize, under this subsection, the importation of any firearm the importation of which is prohibited by section 922(p). . 1604. Protection of shotguns, shotgun shells, and large caliber rifles from arbitrary classification as destructive devices (a) Amendments to the National Firearms Act Section 5845(f) of the Internal Revenue Code of 1986 is amended— (1) in paragraph (2), by striking recognized as particularly suitable for sporting purposes and inserting recognized as suitable for lawful purposes ; and (2) by striking use solely for sporting purposes and inserting use for sporting purposes . (b) Amendments to title 18 , United States Code Section 921(a)(4) of title 18, United States Code, is amended— (1) in subparagraph (B) of the first sentence, by striking particularly suitable for sporting and inserting suitable for lawful