The following tutorial will show you around the part 771 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
A signed original of the applicable form shall be served on the licensee or permittee. If a hearing is requested, a copy shall be sent to the administrative law judge designated to conduct the hearing. Any remaining copies shall be retained for the office of the Director of Industry Operations.