CFR > Title 27 - Alcohol, Tobacco Products and Firearms > CHAPTER II—BUREAU OF ALCOHOL, TOBACCO, FIREARMS, AND EXPLOSIVES, DEPARTMENT OF JUSTICE > SUBCHAPTER B—FIREARMS AND AMMUNITION (parts 400 to 479) > PART 447—IMPORTATION OF ARMS, AMMUNITION AND IMPLEMENTS OF WAR > SUBPART D—Registration (§447.31 to §447.35) > 447.31—Registration requirement.