Sec. 5821 Making tax
(a) Rate. There shall be levied, collected, and paid upon the making of a firearm a tax at the rate of $200 for each firearm made.
(b) By whom paid. The tax imposed by subsection (a) of this section shall be paid by the person making the firearm.
(c) Payment. The tax imposed by subsection (a) of this section shall be payable by the stamp prescribed for payment by the Secretary.