Are 80% Lowers Legal in Oregon? Serialization and Penalties

Yes, 80% lowers are legal in Oregon, but only if they carry a serial number applied by a federally licensed dealer, manufacturer, importer, or gunsmith. Since September 1, 2024, possessing an unserialized unfinished frame or receiver in Oregon is against the law, with penalties that start at a $1,000 fine and escalate to felony charges for repeat offenses. If you already own one or plan to build from one, you need to take it to an FFL and have it serialized before you can legally keep it.

What Oregon Counts as an Unfinished Frame or Receiver

The “80%” label is a marketing convention, not a legal category. Under ORS 166.210, an unfinished frame or receiver is any forging, casting, 3D print, extrusion, or machined body that is either designed to be completed into a functioning frame or receiver, or marketed and sold for that purpose.¹ There is no percentage-of-completion threshold in the statute.

That closes a workaround sellers sometimes try. A polymer pistol frame blank sold with a jig showing where to drill is covered even if the listing calls it a “0% lower.” If the item is designed or marketed to become a frame or receiver, Oregon treats it as one.

The Serialization Requirement

ORS 166.267 prohibits knowingly possessing an unserialized unfinished frame or receiver unless you are a federally licensed manufacturer and the item is in an active production process that includes serialization.² A companion statute, ORS 166.266, applies the same rule to completed firearms manufactured after October 22, 1968.³ Both took effect September 1, 2024, with no grace period and no good-faith exception.⁴

How to Get an 80% Lower Serialized

The Oregon Department of Justice directs owners to take the item to a federally licensed firearms dealer and have the dealer serialize it.⁴ There is no application to the Oregon State Police for a state-issued number. The ATF publishes a searchable list of licensed dealers online.

The serial number must include the manufacturer’s name and a unique identifier, engraved to the standards referenced in 18 U.S.C. § 923(i).² Federal regulation sets minimum depth and size for the engraving, and most FFLs and gunsmiths use laser or mechanical tools to meet it. Expect to pay roughly $40 to $130, depending on the shop and method.

Once the number is on the item, you can legally possess it and continue machining it into a functional lower.

Penalties for Possessing an Unserialized Lower

Oregon’s penalty structure escalates with each offense, and prior violations under ORS 166.265, 166.266, or 166.267 all count toward the escalation, even if a previous conviction was only a violation-level infraction.²

First offense is a Class B violation. Fine up to $1,000 and forfeiture of the item. No jail.⁵
Second offense is a Class A misdemeanor. Up to 364 days in prison, a fine of up to $6,250, or both.⁴
Third or subsequent offense is a felony. Up to 10 years in prison, a fine of up to $250,000, or both.⁴

A conviction at any level triggers mandatory forfeiture of the component or firearm.

Building a Firearm From a Serialized Lower

Federal law lets individuals make firearms for personal use without a manufacturer’s license, and personally made firearms do not require a separate federal serial number as long as you never sell them.⁶ Oregon’s serialization rule on the unfinished frame or receiver sits on top of that federal allowance. Get the blank serialized first, then build.

If you plan to 3D print a frame, the finished firearm still has to meet federal detectability standards. Under ORS 166.265, manufacturing an undetectable firearm is a Class B felony in Oregon.⁷

Selling or Transferring What You Build

Personal use is one thing; selling is another. If you build firearms with the intent to sell them or do so repetitively for money, the ATF considers you engaged in the business of manufacturing, which requires a federal license.⁶

Even a one-off private transfer of a self-made firearm must run through a licensed dealer in Oregon, who conducts a background check through the Oregon State Police Firearms Instant Check System and records the make, model, and serial number.⁸ Handing a self-built rifle to a friend without going through a dealer is illegal, whether or not money changes hands. Transfers of a serialized unfinished frame or receiver also carry federal recordkeeping obligations.²

Who Cannot Build One at All

Serialization does not cure a possession problem. Under 18 U.S.C. § 922(g), federal law prohibits certain people from possessing any firearm or ammunition, and there is no personal-use exception for building your own.⁹ Prohibited persons include anyone with a felony conviction, fugitives from justice, unlawful users of controlled substances, those adjudicated mentally defective or committed to a mental institution, people in the U.S. unlawfully, those dishonorably discharged from the military, those who have renounced U.S. citizenship, people subject to certain domestic violence restraining orders, and anyone with a misdemeanor domestic violence conviction. A violation carries up to 10 years in federal prison.

Narrow Exceptions

Oregon’s serialization laws carve out a limited set of exceptions. The requirement does not apply to antique firearms or firearms manufactured before October 22, 1968; firearms rendered permanently inoperable; federally licensed manufacturers, importers, and dealers handling items within the scope of their license; and federally licensed gunsmiths who take possession of a firearm specifically to engrave a serial number.³

An 80% lower purchased before the September 2024 effective date is not exempt. The Oregon Department of Justice has told owners of unserialized items to visit a local FFL and get them serialized promptly.⁴

1
Oregon Public Law. Oregon Code 166.210 – Definitions
2
Oregon State Legislature. Oregon Revised Statutes 166.267 – Importation, Sale, Transfer or Possession of Unfinished Frame or Receiver
3
Oregon Public Law. Oregon Code 166.266 – Sale, Transfer or Possession of Firearm Without Serial Number
4
Oregon Department of Justice. Ghost Guns and Undetectable Firearms Fact Sheet
5
Oregon Public Law. Oregon Code 153.018 – Maximum Fines
6
Bureau of Alcohol, Tobacco, Firearms and Explosives. Privately Made Firearms
7
Oregon Public Law. Oregon Code 166.265 – Manufacture, Importation, Sale or Transfer of Undetectable Firearm
8
Oregon Public Law. Oregon Code 166.412 – Definitions; Firearms Transaction Record; Criminal History Record Check; Prohibited Transfer Report; Liability; Rules
9
Office of the Law Revision Counsel. 18 USC 922 – Unlawful Acts