If you’re making a short-barreled rifle on an approved ATF Form 1, the SBR engraving requirements under 27 CFR 479.102 tell you to mark the receiver with your name (or trust name), the city and state where you made it, a serial number, and the caliber, all before you assemble the firearm in its short-barreled configuration. The markings have to be at least 0.003 inches deep, the serial number characters at least 1/16 inch tall, and every detail has to match your approved Form 1 exactly.1eCFR. 27 CFR 479.102 – Identification of Firearms
Who Actually Has to Engrave
The rule applies to the person who “makes” the firearm. If you filed a Form 1 to convert a pistol, rifle, or stripped receiver into an SBR, that’s you. Your information goes on the gun.1eCFR. 27 CFR 479.102 – Identification of Firearms
If instead you bought a factory-built SBR through a dealer on a Form 4 transfer, you don’t add anything. The manufacturer already marked it during production, and the regulation lets subsequent owners rely on those existing markings.1eCFR. 27 CFR 479.102 – Identification of Firearms
What Information Goes on the Firearm
The regulation splits the required markings into two groups with different placement rules.
On the frame or receiver only:
- A serial number that doesn’t duplicate any serial number you’ve used on another firearm. If the receiver already carries a manufacturer’s serial from its original production, you can adopt that number rather than assigning a new one, but you still have to add your maker information.
- Your name. For an individual filer, that means your legal name as it appears on the approved Form 1. For an NFA trust, engrave the trust’s name, not the trustee’s personal name. The trust is the legal maker.
- The city and state where you made the firearm. Recognized abbreviations are acceptable.
On the frame, receiver, or barrel (your choice):
- Caliber or gauge.
- Model designation, but only if the firearm has a model name. Building from a stripped receiver with no model? You can skip it.
Depth, Size, and Legibility
The physical standards are specific, and “close enough” is not a compliance category.
- Minimum depth of 0.003 inches, measured from the flat surface of the metal rather than from ridges or peaks.
- Serial number characters (and any associated license number) at least 1/16 inch tall, measured between the bases of the character impressions.
- Roman letters and Arabic numerals only. Hyphens are permitted. No decorative fonts or symbols.
- Markings must be conspicuous, visible to the naked eye during normal handling, and unobstructed by other markings when the firearm is fully assembled.
The regulation also requires that the markings not be easily obliterated, altered, or removed. Shallow cosmetic engraving doesn’t qualify.1eCFR. 27 CFR 479.102 – Identification of Firearms
Where on the Firearm the Markings Go
Serial number, maker’s name, and city and state have to sit on the frame or receiver. On an AR-15 platform rifle, that’s the lower receiver. Putting the serial number on the barrel or upper and calling it done is not compliant. Caliber and model designation can go on the frame, receiver, or barrel.1eCFR. 27 CFR 479.102 – Identification of Firearms
If your receiver is polymer, the same depth and size requirements apply. One accepted approach is embedding a metal plate carrying the required markings permanently into the receiver. The markings still have to be visible during normal handling, without disassembly.
The Timing Rule: Engrave Before You Assemble
Engraving has to be complete before the firearm exists in its short-barreled configuration. Attach a barrel under 16 inches, or otherwise configure the gun as an SBR, before the markings are in place, and you’re in possession of an unidentified NFA firearm under 26 U.S.C. § 5861(i).2GovInfo. 26 USC 5861 – Prohibited Acts
The other bookend matters too: don’t engrave anything until your Form 1 is actually approved. A pending application isn’t authorization to make anything.
DIY or Professional Engraver
Federal law doesn’t require a professional. The regulation permits marking “by engraving, casting, stamping (impressing), or otherwise conspicuously placing” the required information. What matters is whether the result meets the depth, size, and legibility standards.
Most people still hire a professional, and there’s a practical reason. A marking that’s 0.002 inches deep rather than 0.003 makes the firearm non-compliant, and you’re not measuring that reliably with household tools. Professional laser engraving on a receiver typically runs $20 to $125, and the engraver can confirm the work meets specifications. Laser engraving and roll stamping are the common methods.
Match the Form 1 Exactly
Every character has to match your approved Form 1. If the form says “John Smith,” engraving “J. Smith” is a problem. If your trust is “Smith Family Gun Trust,” engraving “Smith Trust” is a problem. Individual filers use their legal name. Trust filers use the trust’s full name, not the trustee’s. Read the form back against your engraving order before anything gets cut into the metal.1eCFR. 27 CFR 479.102 – Identification of Firearms
Penalties for Getting It Wrong
Under 26 U.S.C. § 5861, it’s a crime to possess an NFA firearm that isn’t registered to you, to possess one that lacks a required serial number, or to make one in violation of NFA rules. A single SBR with missing or deficient engraving can violate more than one of those provisions at once.2GovInfo. 26 USC 5861 – Prohibited Acts
The penalty for any NFA violation is a fine of up to $10,000, up to ten years in federal prison, or both, and the firearm is subject to seizure and forfeiture.3Office of the Law Revision Counsel. 26 USC 5871 – Penalties A conviction is a felony that permanently ends firearm ownership rights. An ATF examiner who sees engravings that don’t match the Form 1, markings too shallow to measure, or no maker’s marks at all is looking at what the statute treats as an unregistered NFA weapon, and the burden of proving the firearm is properly identified falls on you.
One last boundary worth stating: federal engraving compliance doesn’t override state law. Some states ban short-barreled rifles outright, and an approved federal tax stamp is not a defense to a state charge. Confirm your state allows SBR possession before you file the Form 1.