This ruling clarifies that a weapon made from a wooden rattrap, affixed with a short threaded barrel chambered for a pistol cartridge and which is fired by a wire trigger release is a firearm classified as an “any other weapon” and within the purview of the NFA.

This ruling clarifies that a miniature cannon with a 20-gauge barrel and certain other component parts in its assembled condition is not a “firearm” as defined in section 5848 of the Internal Revenue Code.

This ruling advises that a "Molgun" made of an aluminum casing, an exposed firing mechanism, and a removable insert chamber of 12-gauge bore is a firearm within the purview of the National Firearms Act.

This ruling clarifies that a burglar alarm device consisting of a metal cylinder, hinged in the middle so it can be opened to chamber a 20-gauge shotgun is not a firearm within the purview of the National Firearms Act.

This ruling clarifies at what point a crank-operated gear-driven Gatling guns would fall or would not fall within the purview of the National Firearms Act.

This ruling clarifies that a 20-gauge gun having two barrels pointing in opposite directions, each of which is threaded to a centerpiece containing a firing mechanism and may be concealed on a person, is a firearm within the purview of the National Firearms Act.

This ruling clarifies that removal of firearms from a foreign trade zone for any purpose other than reshipment to a place outside the jurisdiction of the U.S. constitutes importation as of the time they were originally brought within the limits of the U.S.

A .410 gauge gun concealed in a cane, or a pistol grip handgun with 8-inch chambered for a .410 gauge shotgun shell, are firearms within the purview of the NFA.  A flare pistol is not a firearm if capable of firing only pyrotechnic shells or cartridges designed for use with it.

A revolver refitted with a 10-inch barrel and classified as an “any other weapon” and is a firearm under Sec. 2733(a) of the IRC.