You do not alter the serial number.
File your F1 with the make, model, and SN. Overall length, barrel length, and caliber. Get it approved. Then have your trust name, city, and state engraved per regulations on it. That will be your manufacturer markings as you are the manufacturer at that point.
File your F1 with the make, model, and SN. Overall length, barrel length, and caliber. Get it approved. Then have your trust name, city, and state engraved per regulations on it. That will be your manufacturer markings as you are the manufacturer at that point.
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