I just stumbled upon this on:https://www.rainierarms.com/blog/atf-form-1-creating-or-manufacturing-your-own-sbr-faq/
Is engraving required? What are legal locations for engraving the trust info?
Yes, engraving the new manufacturer on the firearm is absolutely required by the ATF. Engraving can be in plastic or metal along as it is at least .003” min depth and 1/16” min print size. The complete trust name along with the city and state the trust is located must be included in the engraving. Trust info can be engraved on the frame, receiver, or barrel. The receiver is the most popular location because any changes to the other components would not require the engraving to be repeated.
Is engraving required? What are legal locations for engraving the trust info?
Yes, engraving the new manufacturer on the firearm is absolutely required by the ATF. Engraving can be in plastic or metal along as it is at least .003” min depth and 1/16” min print size. The complete trust name along with the city and state the trust is located must be included in the engraving. Trust info can be engraved on the frame, receiver, or barrel. The receiver is the most popular location because any changes to the other components would not require the engraving to be repeated.