The Gun Control Act requires that imported firearms be particularly suitable for or readily adaptable to sporting purposes. ATF makes sporting-purpose determinations based on the firearm's features, configuration, and intended use. Shotguns and rifles with certain military-style features may be denied importation even if they would otherwise fall under this heading; importers should obtain an ATF Form 6 approval before shipment.

Signal flare projectors and line-throwing guns (930390) are classified as firearms under the HTS but may be treated differently under ATF regulations depending on their caliber and design. Some devices in this subheading may not meet the statutory definition of a firearm under the Gun Control Act, while others do. Importers should confirm the regulatory status of the specific device with ATF before importation.