Shotgun.

Shotgun. A weapon designed or redesigned, made or remade, and intended to be fired from the shoulder; and designed or redesigned, made or remade, to use the energy or the explosive in a fixed shotgun shell to fire through a smooth bore either a number of projecting (ball shot) or a single projectile for each single pull of the trigger and shall include any such weapon which may be readily restored to fire a fixed shotgun shell.

Source

32 CFR § 552.126

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Scoping language

For the purpose of this part, the following definitions apply:

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