Does the possessor of an NFA firearm have to show proof of registration?
Yes. The approved application received from ATF serves as evidence of registration of the NFA firearm. This document must be made available upon request of any ATF officer. It is suggested that a photocopy of the approved application be carried by the possessor when the weapon is being transported.
[26 U.S.C. 5841(e); 27 CFR 478.101]
Source ATF: https://www.atf.gov/firearms/qa/does-possessor-nfa-firearm-have-show-proof-registration
Other NFA Gun Trust and ATF Related Blog Posts
If you apply using the ATF eForm's site but have to send in the fingerprint cards in by mail, is that considered to be a paper application?
If you apply using the ATF eForm's site but have to send in the fingerprint cards in by mail, is that considered to be a paper application? No, it isn't. When you are applying for a tax stamp appli...
ATF Form 4 NFA Tax Stamp Individual to Gun Trust Transfer Walk-Through Guide
How to guide and walk-through guide for the ATF Form 4 NFA Tax Stamp Application - Individual to Gun Trust Walk-Through Guide ATF 5320.4 Application for Tax Paid Transfer and Registration of Firear...
ATF Form 4 NFA Tax Stamp Gun Trust to Gun Trust Transfer Walk-Through Guide
How to guide and walk-through guide for the ATF Form 4 NFA Tax Stamp Application - Gun Trust to Gun Trust Walk-Through Guide ATF 5320.4 Application for Tax Paid Transfer and Registration of Firearm...