[Code of Federal Regulations] [Title 27, Volume 1] [Revised as of April 1, 2002] From the U.S. Government Printing Office via GPO Access [CITE: 27CFR179.67] [Page 1213] TITLE 27--ALCOHOL, TOBACCO PRODUCTS AND FIREARMS CHAPTER I--BUREAU OF ALCOHOL, TOBACCO AND FIREARMS, DEPARTMENT OF THE TREASURY PART 179--MACHINE GUNS, DESTRUCTIVE DEVICES, AND CERTAIN OTHER FIREARMS--Table of Contents Subpart E--Tax on Making Firearms Sec. 179.67 Cancellation of stamp. The person affixing to a Form 1 (Firearms) a ``National Firearms Act'' stamp shall cancel it by writing or stamping thereon, in ink, his initials, and the day, month and year, in such manner as to render it unfit for reuse. The cancellation shall not so deface the stamp as to prevent its denomination and genuineness from being readily determined. Exceptions to Tax on Making Firearms