Slavage,
From the ATF website.
How does an individual obtain authorization to make an NFA firearm?
Prior to making the firearm, the individual must submit ATF Form 1, Application to Make and Register a Firearm, to the Bureau of ATF, NFA Branch, Washington, DC 20226, and receive approval. The applicant must follow the procedures described in Question M15 concerning completion of the form, including photographs, fingerprints and certifications. The applicant must forward the original and a duplicate of the form along with a check or money order for $200 made payable to the Bureau of ATF. If the application is approved, the original of the form with the cancelled stamp affixed showing approval will be returned to the applicant. Otherwise, the tax will be refunded. [26 U. S. C 5822, 27 CFR 179.62-179.65]
Bill