A firearm is not automatically illegal in Tennessee simply because it was made with a 3D printer. Federal law also does not prohibit a person who may legally possess firearms from making certain non-NFA firearms for personal use.
That does not mean every 3D-printed gun or privately made firearm is lawful.
The legal questions depend on what was made, who possesses it, whether the firearm meets federal detectability requirements, whether it qualifies as a machine gun or another specially regulated weapon, and whether the person made firearms for personal use or as part of a firearms business.
For someone facing an investigation, the term “ghost gun” does not answer those questions. The firearm’s legal classification and the circumstances surrounding its manufacture, possession, or transfer are what matter. For more information on navigating charges and legal representation, visit our Tennessee & Georgia State Criminal Defense page.
What Is a 3D-Printed Gun?
“3D-printed gun” is not a separate legal category of firearm.
A 3D printer may be used to create a firearm frame, receiver, or another component. Some privately made firearms contain a mixture of printed parts and commercially manufactured components.
Federal regulations use the term privately made firearm, or PMF. A PMF is a firearm, including a frame or receiver, completed, assembled, or otherwise produced by someone other than a licensed manufacturer and without a serial number placed by a licensed manufacturer at the time it was produced.
“Ghost gun” is an informal term frequently used to describe an unserialized privately made firearm. The fact that a firearm does not have a manufacturer-applied serial number does not automatically mean that the firearm is illegal.
The Bureau of Alcohol, Tobacco, Firearms and Explosives also recognizes that individuals may use 3D printing and other manufacturing processes to make firearms, subject to applicable federal firearm laws. The ATF provides additional information in its Privately Made Firearms guidance.
Are Ghost Guns and 3D-Printed Guns Legal in Tennessee?
Tennessee does not impose a blanket criminal prohibition on a firearm solely because a 3D printer was used to produce it.
Instead, Tennessee firearm laws address matters such as the type of weapon involved, whether the person may legally possess a firearm, where a firearm may be possessed, and how the weapon is used.
Making an otherwise lawful firearm with a 3D printer does not, by itself, turn that firearm into a prohibited weapon.
The opposite is also true. Using a 3D printer to manufacture something that falls within the legal definition of a prohibited weapon does not make that weapon lawful.
The same principle applies to the person possessing the firearm. Someone who is prohibited from possessing firearms does not create an exception by manufacturing the firearm instead of purchasing it.
Can Someone Make a Gun for Personal Use?
Federal law does not prohibit a person who may lawfully possess firearms from making a non-NFA privately made firearm for personal use.
That limitation is important.
The National Firearms Act separately regulates certain categories of weapons, including machine guns, short-barreled rifles, short-barreled shotguns, silencers, destructive devices, and certain firearms classified as “any other weapon.”
The rules governing personal manufacture of an ordinary non-NFA firearm do not eliminate the separate federal requirements that apply to NFA firearms.
Federal law also distinguishes between making a firearm for personal use and engaging in the business of manufacturing firearms for sale or distribution.
A person engaged in the business of manufacturing firearms for sale or distribution must comply with federal licensing requirements. An investigation involving multiple firearms or sales may therefore focus on the purpose of the manufacturing activity and whether the conduct satisfies the federal definition of being engaged in the business.
Making a firearm at home does not provide an exemption from federal firearms-business laws.
What If Only Part of the Gun Is 3D-Printed?
A firearm component does not automatically become a regulated firearm merely because it was created with a 3D printer.
The legal classification of the particular component matters.
Frames and receivers receive special treatment under federal law. Federal regulations also address some partially complete frames, receivers, and weapon-parts kits.
This issue reached the U.S. Supreme Court in Bondi v. VanDerStok.
The Supreme Court concluded that at least some weapon-parts kits and some partially complete frames or receivers can fall within the federal Gun Control Act. The Court did not hold that every unfinished firearm component automatically qualifies as a firearm.
The distinction can become important in a criminal case involving a 3D-printed part. Prosecutors may need to establish that the object involved actually satisfies the statutory definition of a firearm, frame, receiver, machine gun, or another regulated item.
The official Supreme Court decision is available in Bondi v. VanDerStok.
Does a 3D-Printed Gun Need a Serial Number?
Not every non-NFA firearm privately made by an eligible individual for personal use must have a manufacturer-applied serial number.
ATF guidance states that an eligible individual who makes a qualifying non-NFA PMF for personal use does not have to add a serial number or register the firearm merely because the individual made it.
NFA firearms are different. They remain subject to separate federal approval, registration, and identification requirements.
Different rules also apply when a federally licensed firearms business receives a privately made firearm into inventory. Federal regulations require a covered licensee to identify a qualifying PMF with a unique serial number within the time required by federal law.
There is another important distinction between an unserialized firearm and a firearm with a removed serial number.
A firearm that never received a manufacturer’s serial number because it was privately made is not the same thing as a firearm that originally had a serial number and later had that number removed, obliterated, or altered.
Federal law separately addresses certain conduct involving firearms whose manufacturer or importer serial number has been removed, obliterated, or altered under 18 U.S.C. § 922(k).
The absence of a serial number therefore does not resolve the legal issue without understanding why the number is missing.
Federal Law Still Requires Firearms to Be Detectable
The Undetectable Firearms Act is especially relevant when discussing firearms containing substantial polymer or 3D-printed components.
Under 18 U.S.C. § 922(p), federal law prohibits specified conduct involving firearms that fail federal detectability requirements, subject to statutory exceptions.
The law reaches conduct including manufacturing, importing, selling, shipping, delivering, possessing, transferring, or receiving a firearm that fails the statutory standard.
Federal law also contains requirements concerning the detectability of major firearm components through airport-style X-ray equipment.
The use of plastic, polymer, or additive manufacturing does not create an exception from federal detectability law.
3D-Printed Machine Gun Conversion Devices Raise Separate Criminal Issues
A 3D-printed component designed and intended to convert a semiautomatic firearm into a machine gun raises different legal issues from an ordinary privately made firearm.
Under federal law, a qualifying machine gun conversion device may itself fall within the definition of a machine gun even when it has not been installed in a firearm.
Tennessee also changed its machine gun law effective July 1, 2025.
Tennessee law expanded the definition of a machine gun to include a part, or combination of parts, designed and intended solely for use in converting a firearm into a machine gun.
The state also increased the offense involving intentional or knowing possession, manufacture, transport, repair, or sale of a machine gun from a Class E felony to a Class C felony.
The fact that a conversion device was produced with a 3D printer rather than purchased from another person does not remove it from those laws if the device satisfies the statutory definition.
Tennessee law also contains important exceptions and defenses. Under Tenn. Code Ann. § 39-17-1302(d), the prohibited-weapons statute does not apply to the acquisition or possession of a machine gun when the person is in full compliance with the requirements of the National Firearms Act. Tenn. Code Ann. § 39-17-1302(b) provides separate defenses for specified circumstances, including certain military, law-enforcement, commercial, research, and museum-related conduct.
Because federal machine gun law may also apply, allegations involving printed conversion devices can present both Tennessee and federal criminal issues.
What Did the Supreme Court Decide About Ghost Guns?
In March 2025, the U.S. Supreme Court decided Bondi v. VanDerStok.
The case involved ATF’s rule regulating firearm frames, receivers, and certain weapon-parts kits.
The Supreme Court rejected the facial challenge to the rule. It held that the Gun Control Act can cover at least some weapon-parts kits that may readily be converted into operable firearms and at least some partially complete frames or receivers.
The decision did not declare every unfinished component to be a firearm.
It also did not make privately manufactured firearms illegal as a category.
Instead, the decision confirmed that federal firearm law can apply before a weapon has been completely assembled when the particular item falls within the statutory definition.
What Changed in the Federal Ghost-Gun Litigation in 2026?
The Supreme Court’s 2025 decision did not end litigation over ATF’s frame-or-receiver rule.
On August 17, 2026, the U.S. District Court for the Northern District of Texas issued another decision in Defense Distributed v. Blanche, Civil Action No. 4:22-cv-00691-O.
The district court concluded that challenged portions of 27 C.F.R. §§ 478.11 and 478.12(c) violated the Second Amendment and were void for vagueness under the Fifth Amendment as to Defense Distributed, the Second Amendment Foundation, and SAF’s current or future members.
The scope of the ruling is important.
The court’s permanent injunction was narrower than a nationwide invalidation of the federal rule. It restricted enforcement against the named parties and SAF members with respect to identified Defense Distributed products.
The court did not vacate ATF’s frame-or-receiver rule nationwide.
Someone in Tennessee should therefore not interpret the 2026 decision as establishing that unfinished frames, receivers, or weapon-parts kits are now outside federal regulation for everyone.
The Supreme Court’s decision concerning ATF’s statutory authority remains significant, while constitutional litigation concerning application of the rule continues.
Can a Person Prohibited From Having a Gun Make One With a 3D Printer?
No manufacturing method creates an exception from firearm-possession restrictions.
Federal law, including 18 U.S.C. § 922(g), prohibits firearm possession by several categories of people.
Tennessee also has separate firearm-possession restrictions, including provisions in Tenn. Code Ann. § 39-17-1307.
Which restriction applies depends on the person’s circumstances and the legal basis for the alleged prohibition.
A firearm does not stop being a firearm for possession purposes because a person printed or assembled it rather than purchasing a finished weapon.
Can Selling 3D-Printed Guns Lead to Federal Charges?
Making a firearm for personal use and manufacturing firearms as a business are legally different activities.
Federal law requires appropriate licensing when a person is engaged in the business of manufacturing firearms for sale or distribution.
An investigation involving repeated manufacturing or sales may therefore focus on the purpose of the activity, the circumstances surrounding transactions, and whether prosecutors can establish the elements of an unlicensed firearms-business offense.
Separate federal issues may arise from interstate transactions, transfers to prohibited persons, NFA firearms, machine gun conversion devices, and privately made firearms that enter a federal firearms licensee’s inventory.
Davis & Hoss discusses these types of federal investigations in more detail on our Federal Firearm Defense Service page.
What Can Matter When Police Seize a 3D-Printed Firearm?
The presence of a privately made firearm does not, by itself, establish that a crime occurred.
Depending on the charge, disputed issues may include whether the seized object satisfies the statutory definition alleged by prosecutors, whether the accused knowingly possessed it, whether the accused was prohibited from possessing firearms, and whether a particular component qualifies as a machine gun or another regulated firearm.
How police obtained the evidence can also matter.
Defense counsel may examine whether officers had a warrant, whether the search stayed within the lawful scope of that warrant or another recognized basis for the search, and whether there are grounds to challenge the seizure or seek suppression of evidence.
A federal investigation may raise additional questions concerning manufacturing or sales activity and whether the government can prove that the accused was engaged in an unlicensed firearms business.
How a case is handled can depend on the specific charge and local court procedures.
For additional information about defending Tennessee criminal allegations, see our Criminal Defense Services page.
Frequently Asked Questions About 3D-Printed Guns in Tennessee
Are ghost guns illegal in Tennessee?
A firearm is not automatically illegal in Tennessee solely because it was privately made, lacks a manufacturer-applied serial number, or contains a 3D-printed component. State or federal law may still prohibit the firearm or its possession based on the weapon’s classification, the person’s legal status, where the firearm is possessed, or other conduct involved.
Does a homemade firearm need a serial number?
Not every non-NFA firearm made by an eligible individual for personal use must have a manufacturer-applied serial number. Different federal requirements apply to NFA firearms and when a federally licensed firearms business receives a qualifying PMF into inventory. A firearm whose original serial number was removed or altered presents a separate legal issue.
Can a prohibited person possess a 3D-printed firearm?
No. A person who is prohibited from firearm possession cannot avoid that restriction by making the firearm personally rather than purchasing it.
Is a mostly plastic 3D-printed gun legal?
The material alone does not determine legality. A firearm remains subject to the federal detectability requirements in 18 U.S.C. § 922(p), along with other applicable state and federal firearm laws.
Is a 3D-printed auto sear legal in Tennessee?
A printed component that meets the legal definition of a machine gun conversion device can trigger serious Tennessee and federal firearm laws. Tennessee includes qualifying conversion parts within its machine gun definition, and federal law can also treat qualifying conversion devices as machine guns.
Facing a 3D-Printed Firearm Investigation in Tennessee?
Whether a 3D-printed firearm is lawful depends on more than the technology used to make it.
Cases involving privately made firearms may turn on the legal classification of the firearm or component, the person’s right to possess firearms, federal detectability requirements, serial-number evidence, alleged manufacturing or sales activity, and how law enforcement obtained the evidence.
They may also involve overlapping Tennessee and federal firearm statutes.
If law enforcement has seized a privately made firearm, or if ATF or another agency is investigating alleged firearm manufacturing, possession, or sales, obtaining legal advice before providing a statement can be important.
Davis & Hoss represents defendants facing state and federal criminal allegations involving firearms and weapons.