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
Any person who engages in a business taxable under 26 U.S.C. 5801, without timely payment of the tax imposed with respect to such business (see § 479.34) shall be liable for such tax, plus the interest and penalties thereon (see 26 U.S.C. 6601 and 6651). In addition, such person may be liable for criminal penalties under 26 U.S.C. 5871.