To me, the below two FAQ's are the most important ones.
15. WHAT DO I PUT IN SECTION 4H, ADDITIONAL DESCRIPTION WHICH ASKS FOR THE REQUIRED
MAKER’S MARKINGS, TO INCLUDE MAKER’S NAME AS REGISTERED, CITY AND STATE AS EACH
WILL APPEAR ON FIREARM?
Answer: Enter the name of the original manufacturer or importer, city, and State as marked on
the frame or receiver of the firearm. If the firearm was made by a non-licensee and has no
markings (e.g., a privately made firearm), then enter the applicant’s name, city, and State from
Section 3b.
18. HOW MUST A FIREARM THAT IS REGISTERED PURSUANT TO FINAL RULE 2021R-08F BE MARKED?
Answer: A firearm that is not marked, such as a privately made firearm (PMF), must be marked in
accordance with the maker marking requirements under 27 CFR 479.102(a) before submission of the
eForm1.
However, if the firearm is already marked, the person registering the firearm pursuant to Final
Rule 2021R-08F may adopt all of the original manufacturer or importer markings when registering
the
firearm, to include the name, city, and state of the original manufacturer or importer as identified on
the frame or receiver of the firearm.