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18 U.S. Code § 921. Definitions
(a) As used in this chapter—
(1)
The term “person” and the term “whoever” include any individual, corporation, company, association, firm, partnership, society, or joint stock company.
(2)
The term “interstate or foreign commerce” includes commerce between any place in a State and any place outside of that State, or within any possession of the United States (not including the Canal Zone) or the District of Columbia, but such term does not include commerce between places within the same State but through any place outside of that State. The term “State” includes the District of Columbia, the Commonwealth of Puerto Rico, and the possessions of the United States (not including the Canal Zone).
(3)
The term “firearm” means (A) any weapon (including a starter gun) which will or is designed to or may readily be converted to expel a projectile by the action of an explosive; (B) the frame or receiver of any such weapon; (C) any firearm muffler or firearm silencer; or (D) any destructive device. Such term does not include an antique firearm.
(4) The term “destructive device” means—
(A) any explosive, incendiary, or poison gas—
(i)
bomb,
(ii)
grenade,
(iii)
rocket having a propellant charge of more than four ounces,
(iv)
missile having an explosive or incendiary charge of more than one-quarter ounce,
(v)
mine, or
(vi)
device similar to any of the devices described in the preceding clauses;
(B)
any type of weapon (other than a shotgun or a shotgun shell which the Attorney General finds is generally recognized as particularly suitable for sporting purposes) by whatever name known which will, or which may be readily converted to, expel a projectile by the action of an explosive or other propellant, and which has any barrel with a bore of more than one-half inch in diameter; and
(C)
any combination of parts either designed or intended for use in converting any device into any destructive device described in subparagraph (A) or (B) and from which a destructive device may be readily assembled.
The term “destructive device” shall not include any device which is neither designed nor redesigned for use as a weapon; any device, although originally designed for use as a weapon, which is redesigned for use as a signaling, pyrotechnic, line throwing, safety, or similar device; surplus ordnance sold, loaned, or given by the Secretary of the Army pursuant to the provisions of section 7684(2), 7685, or 7686 of title 10; or any other device which the Attorney General finds is not likely to be used as a weapon, is an antique, or is a rifle which the owner intends to use solely for sporting, recreational or cultural purposes.
(5)
The term “shotgun” means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of an explosive to fire through a smooth bore either a number of ball shot or a single projectile for each single pull of the trigger.
(6)
The term “short-barreled shotgun” means a shotgun having one or more barrels less than eighteen inches in length and any weapon made from a shotgun (whether by alteration, modification or otherwise) if such a weapon as modified has an overall length of less than twenty-six inches.
(7)
The term “rifle” means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of an explosive to fire only a single projectile through a rifled bore for each single pull of the trigger.
(8)
The term “short-barreled rifle” means a rifle having one or more barrels less than sixteen inches in length and any weapon made from a rifle (whether by alteration, modification, or otherwise) if such weapon, as modified, has an overall length of less than twenty-six inches.
(9)
The term “importer” means any person engaged in the business of importing or bringing firearms or ammunition into the United States for purposes of sale or distribution; and the term “licensed importer” means any such person licensed under the provisions of this chapter.
(10)
The term “manufacturer” means any person engaged in the business of manufacturing firearms or ammunition for purposes of sale or distribution; and the term “licensed manufacturer” means any such person licensed under the provisions of this chapter.
(11)
The term “dealer” means (A) any person engaged in the business of selling firearms at wholesale or retail, (B) any person engaged in the business of repairing firearms or of making or fitting special barrels, stocks, or trigger mechanisms to firearms, or (C) any person who is a pawnbroker. The term “licensed dealer” means any dealer who is licensed under the provisions of this chapter.