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
If a licensee or permittee surrenders the license or permit before the notice of revocation or denial of renewal, the Director of Industry Operations may accept the surrender. But if the evidence, in the opinion of the Director of Industry Operations, warrants issuance of a notice for revocation or denial of renewal, the surrender shall be refused and the Director of Industry Operations shall issue the notice.