27 C.F.R. § 555.204 Inspection of magazines.
Title 27 - Alcohol, Tobacco Products and Firearms
Any person storing explosive materials shall inspect his magazines at least every seven days. This inspection need not be an inventory, but must be sufficient to determine whether there has been unauthorized entry or attempted entry into the magazines, or unauthorized removal of the contents of the magazines.
Title 27: Alcohol, Tobacco and Firearms
PART 555—COMMERCE IN EXPLOSIVES
Subpart K—Storage
§ 555.204 Inspection of magazines.