The following tutorial will show you around the part 479 landing page.
27 CFR Part 447
Importation of Arms, Ammunition and Implements of War
27 CFR Part 478
Commerce in Firearms and Ammunition
27 CFR Part 479
Machine Guns, Destructive Devices, and Certain Other Firearms
27 CFR Part 555
Commerce in Explosives
27 CFR Part 646
Contraband Cigarettes
27 CFR Part 771
Rules of Practice in Explosive License and Permit Proceedings
Effective date is the date this part was last amended
The transfer tax imposed with respect to firearms transferred within the United States is at the rate of $200 for each firearm transferred, except that the transfer tax on any firearm classified as “any other weapon” shall be at the rate of $5 for each such firearm transferred. The tax imposed on the transfer of the firearm shall be paid by the transferor.