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
In hearings on the revocation or denial of renewal of a license or permit, the burden of proof is on the Government to show that the Director of Industry Operations had reason to believe that the licensee or permittee is not entitled to a permit or license, as may be the case. The Government must meet this proof by a preponderance of the evidence.