Pennsylvania law (18 Pa.C.S. 908) makes it a crime to possess or deal in certain "offensive weapons," but the statute also provides a defense for items...
Reviewed by Will Luker, Founder of CCW Hub. USCCA Training Counselor, USCCA Certified Instructor, NRA Certified Instructor, Law Enforcement.
Pennsylvania law (18 Pa.C.S. 908) makes it a crime to possess or deal in certain "offensive weapons," but the statute also provides a defense for items possessed in compliance with the federal National Firearms Act (26 U.S.C. 5801 et seq.). That defense, at 18 Pa.C.S. 908(b)(1), is what makes suppressors, short-barreled shotguns (SBSs), and machine guns lawful for civilian ownership in the Commonwealth, provided each item is properly registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). Short-barreled rifles (SBRs) and most any-other-weapons (AOWs) are not on the state "offensive weapons" list at all, so they are lawful in Pennsylvania once the federal registration is in place.
One correction up front, because it matters for anyone relying on a statute number: the federal-NFA defense is in subsection (b)(1) of Section 908, not subsection (c). Subsection (c) of Section 908 contains only definitions ("Firearm" and "Offensive weapons"). The misdemeanor grade for an unlawful offensive weapon is stated in subsection (a) itself. Read 18 Pa.C.S. 908 directly before citing a subsection.
Bottom line for Pennsylvania residents: if your NFA item is registered in your name (or a qualifying trust or entity) on an ATF Form 1 or Form 4, and you are a person allowed to possess it under federal law, you have a complete defense to a Pennsylvania Section 908 charge. Pennsylvania does not run its own NFA registry, does not impose a state-level NFA tax, and does not require a separate state permit for the item beyond the federal registration. If federal compliance is missing or has lapsed, possession is a Pennsylvania misdemeanor of the first degree under 18 Pa.C.S. 908(a) and a separate federal felony under the NFA's possession-of-unregistered-firearm offense (26 U.S.C. 5861(d)). One important limit: the state defense does not extend to a bomb, grenade, or incendiary device, so federal registration does not cure those under Pennsylvania law.
Section 908 sits in Chapter 9 of the Pennsylvania Crimes Code (Title 18) and is titled "Prohibited offensive weapons." Subsection (a) provides that a person commits a misdemeanor of the first degree if, "except as authorized by law," he makes, repairs, sells, or otherwise deals in, uses, or possesses any offensive weapon. A misdemeanor of the first degree in Pennsylvania carries up to 5 years in prison and a fine of up to $10,000.
Section 908(c) defines "offensive weapons" as any of the following:
Three of those items overlap directly with the federal NFA categories: machine guns, short-barreled shotguns (the "sawed-off shotgun with a barrel less than 18 inches" clause), and suppressors (a firearm "specially made or specially adapted for concealment or silent discharge"). For each, the next subsection is what protects the lawful owner.
Note what the list does not include. Section 908(c) does not list switchblades or other automatic-opening knives, and it does not list rifles with barrels under 16 inches. Those are not "offensive weapons" under Pennsylvania law.
Section 908(b)(1) is a statutory defense. It provides that it is a defense for the defendant to prove by a preponderance of the evidence that, "with the exception of a bomb, grenade or incendiary device, he complied with the National Firearms Act (26 U.S.C. 5801 et seq.)." In plain terms, lawful NFA registration is the path to legal possession of a regulated machine gun, SBS, or suppressor in Pennsylvania.
The Philadelphia Police Department's gun-permits unit states the practical rule the same way: possession of a machine gun, sawed-off shotgun, or firearm with a "silencer" is permitted when purchased pursuant to the National Firearms Act.
In practical terms, NFA compliance means:
If those conditions are met, the Section 908(b)(1) defense applies and the item is lawful in your hands. If any one of them is missing, the Section 908(a) prohibition controls, the item is contraband under Pennsylvania law, and possession is a state crime in addition to the federal NFA's possession-of-unregistered-firearm offense (26 U.S.C. 5861(d)).
Two things to keep straight. First, the defense excludes a bomb, grenade, or incendiary device by its own terms, so federal registration does not make a destructive device of that kind lawful under Section 908. Second, Section 908(b)(3) separately provides that the section does not apply to a person who possesses any firearm "for purposes not prohibited by the laws of this Commonwealth," which is the textual basis for treating ordinary firearms (and items like SBRs that are not on the offensive-weapons list) as outside Section 908 entirely.
Some federal NFA categories have no parallel Pennsylvania state prohibition. Short-barreled rifles are the clearest example: Section 908(c) reaches sawed-off shotguns with barrels under 18 inches but does not list rifles with barrels under 16 inches. An SBR registered with ATF on a Form 1 or Form 4 is therefore lawful in Pennsylvania without needing the Section 908(b)(1) defense at all. Most AOWs are likewise not categorically prohibited by Section 908(c), although an individual disguised or concealable configuration can fall under the "specially made or specially adapted for concealment or silent discharge" clause.
Suppressors are NFA-regulated. They are registered to a specific person, trust, or entity, require an ATF Form 4 transfer (or a Form 1 to make one), and go through a federal background check that includes fingerprints and a photograph.
In Pennsylvania, a firearm equipped with a suppressor is "specially made or specially adapted for ... silent discharge" within the meaning of Section 908(c), so absent NFA compliance it is treated as an offensive weapon. The Section 908(b)(1) defense is the path to lawful ownership: an ATF-approved registration puts you in compliance and defeats a Section 908 charge. Pennsylvania requires no separate state suppressor permit or registration.
What changed at the federal level: under P.L. 119-21 (the reconciliation act signed July 4, 2025), the federal making tax (26 U.S.C. 5821) and transfer tax (26 U.S.C. 5811) for NFA firearms that are not machine guns or destructive devices were set to $0. The change applies to calendar quarters beginning more than 90 days after enactment, which makes the first qualifying quarter January 1, 2026. Suppressors, SBRs, SBSs, and AOWs now move on a $0 tax stamp. Machine guns and destructive devices remain at the $200 rate. P.L. 119-21 did not change the registration requirement, the background check, the fingerprinting, the photograph, the responsible-person paperwork for trusts, or any other operative NFA control. Confirm the current tax treatment with your dealer at the time of transfer.
Pennsylvania did not add or remove anything in response to P.L. 119-21. The state rule is unchanged: a suppressor that does not meet NFA requirements is offensive-weapon contraband under Section 908, and an unregistered suppressor remains a misdemeanor of the first degree regardless of whether any federal tax was owed. The $0 federal tax does not waive the registration requirement.
The Pennsylvania Game Commission separately allows suppressor use for hunting. Hunting rules can change, so consult the current Game Commission digest before relying on a suppressor in the field.
Machine guns are on the Section 908(c) "machine gun" list and carry an extra federal limit. Under 18 U.S.C. 922(o), it is unlawful to transfer or possess a machine gun, except for a machine gun lawfully possessed before the date that subsection took effect, which is May 19, 1986. The federal registry was closed to new civilian transferable machine guns on that date. Machine guns lawfully registered before May 19, 1986 may continue to be possessed and may be transferred to other qualified civilians, subject to ATF approval on a Form 4.
Applied to Pennsylvania:
Machine guns continue to carry the $200 NFA transfer and making tax. The P.L. 119-21 $0 rate does not apply to them.
A shotgun with a barrel under 18 inches falls under Section 908(c)'s "sawed-off shotgun with a barrel less than 18 inches" clause, so absent NFA compliance it is an offensive weapon. The federal NFA definition (26 U.S.C. 5845(a)) uses the same 18-inch barrel threshold and adds a 26-inch overall-length threshold for a weapon made from a shotgun by modification.
To possess an SBS in Pennsylvania you need:
That federal registration supports the Section 908(b)(1) defense. Pennsylvania does not impose a separate state-issued SBS permit and does not require state paperwork beyond the standard 18 Pa.C.S. 6111 record of sale that a dealer already completes for any firearm transfer. Keep the approved Form 4 or Form 1 with the SBS.
Section 908(c) does not list rifles with barrels under 16 inches as offensive weapons. Pennsylvania has no statute that separately prohibits SBRs as a category, so an SBR registered with ATF on a Form 1 or Form 4 is lawful in Pennsylvania without needing any state-law defense or carve-out beyond the federal registration itself.
This is a real difference from how Pennsylvania treats suppressors, SBSs, and machine guns, which are state-law offensive weapons unless the Section 908(b)(1) defense applies. SBRs are simply not on the Section 908(c) list. The federal requirement still applies: an unregistered SBR is the federal NFA's possession-of-unregistered-firearm offense (26 U.S.C. 5861(d)), and building a regulated SBR configuration (cutting a rifle barrel under 16 inches, or attaching a stock to a pistol, without an approved Form 1) is a federal violation regardless of how Pennsylvania treats it. Build or buy on an approved Form 1 or Form 4 before assembling the configuration. The state-side exposure for an SBR specifically is lower than for a suppressor, machine gun, or SBS, because there is no parallel state prohibition.
"Any other weapon" (AOW) is defined at 26 U.S.C. 5845(e) and includes weapons capable of being concealed on the person from which a shot can be discharged, smooth-bore pistols designed to fire a shotgun shell, and certain combination weapons. AOWs are NFA-registered. Historically the AOW transfer tax was $5; under P.L. 119-21 the transfer and making tax for AOWs is $0 in qualifying quarters beginning January 1, 2026.
Pennsylvania does not separately prohibit AOWs as a category. An individual AOW configuration may overlap with Section 908(c)'s "specially made or specially adapted for concealment" clause; a pen gun or cane gun is plainly made for concealment. For those configurations, the Section 908(b)(1) NFA defense controls.
Destructive devices (grenades, bombs, mines, and firearms with a bore over half an inch with sporting exceptions) are NFA-registered and keep the $200 transfer and making tax that P.L. 119-21 left in place. Here Pennsylvania is stricter than federal registration alone: Section 908(c) reaches "any bomb or grenade" directly, and Section 908(b)(1) expressly excludes a bomb, grenade, or incendiary device from the NFA-compliance defense. Federal registration of such a device does not provide a defense under Pennsylvania law. The universe of civilian-registered destructive devices is small, and Pennsylvania residents should treat bombs, grenades, and incendiary devices as prohibited under state law regardless of any federal stamp.
| Offense | Statute | Classification | Maximum prison | Maximum fine |
|---|---|---|---|---|
| Possess unregistered suppressor, machine gun, or SBS | 18 Pa.C.S. 908(a) | Misdemeanor of the first degree | 5 years | $10,000 |
| Make or sell an unregistered offensive weapon | 18 Pa.C.S. 908(a) | Misdemeanor of the first degree | 5 years | $10,000 |
| Possess a bomb, grenade, or incendiary device (no NFA defense available) | 18 Pa.C.S. 908(a), 908(b)(1) | Misdemeanor of the first degree | 5 years | $10,000 |
| Federal possession of any unregistered NFA firearm | 26 U.S.C. 5861(d) | Federal felony | 10 years | $250,000 |
| Possess a machine gun not lawfully possessed before May 19, 1986 (civilian) | 18 U.S.C. 922(o) | Federal felony | 10 years | $250,000 |
| Possess an unregistered SBR (Pennsylvania state law) | None at the state level | Not listed in Section 908(c) | n/a | n/a |
State and federal charges come from separate sovereigns. A single act of unlawful NFA possession in Pennsylvania can produce both a state Section 908 prosecution and a separate federal prosecution under 26 U.S.C. 5861(d). A Section 908 conviction is also one of the enumerated offenses under 18 Pa.C.S. 6105(b), which triggers the Pennsylvania firearms prohibition in 6105(a): a person convicted under Section 908 may not possess, use, control, sell, transfer, or manufacture a firearm in Pennsylvania, and may seek restoration only through the relief process in 6105(d), which for an enumerated offense generally requires that ten years have passed since the most recent conviction.
If you are a Pennsylvania resident buying an NFA item from a Pennsylvania FFL or Class III dealer:
For SBR and SBS purchases through a Pennsylvania FFL, the dealer also handles the standard 18 Pa.C.S. 6111 record of sale. That state paperwork is in addition to, not in place of, the federal form.
NFA gun trusts are legal in Pennsylvania and widely used. They offer shared access for co-trustees, simplified inheritance, and a single legal entity that can hold multiple NFA items over time. Since the 41F rule, every "responsible person" listed on the trust must complete fingerprints, a photograph, and the CLEO notification. Pennsylvania does not impose state-specific trust formalities for NFA ownership. Consult counsel before drafting.
Federal rules in 27 C.F.R. Part 479 govern out-of-state movement of NFA items. Machine guns, SBRs, SBSs, and destructive devices require advance ATF approval (Form 5320.20) before interstate transport. Suppressors generally do not require advance approval, but you should still verify the destination state's law, because some states prohibit suppressors regardless of federal registration. Within Pennsylvania, an NFA-compliant owner may transport a registered suppressor, SBS, machine gun, or SBR on the same terms as any other firearm, subject to 18 Pa.C.S. 6106 (carrying a firearm concealed or in a vehicle without a License to Carry Firearms) and 18 Pa.C.S. 6108 (carrying on the public streets or property of Philadelphia).
The operative state authority for NFA items in Pennsylvania is 18 Pa.C.S. 908, with the offense and grade in subsection (a), the federal-NFA defense in subsection (b)(1) (which excludes a bomb, grenade, or incendiary device), and the definitions in subsection (c). Related state authorities are 18 Pa.C.S. 6105 (the prohibitor statute, which lists Section 908 as an enumerated offense in subsection (b)), 18 Pa.C.S. 6106 and 6108 (carry rules), and 18 Pa.C.S. 6111 (the dealer record of sale). The federal authorities that control NFA registration are the National Firearms Act (26 U.S.C. 5801 et seq.), including the transfer tax (26 U.S.C. 5811), the making tax (26 U.S.C. 5821), the registration record (26 U.S.C. 5841), the definitions including the AOW definition (26 U.S.C. 5845, with AOW at 5845(e)), and the prohibition on possessing an unregistered NFA firearm (26 U.S.C. 5861(d)). The federal machine-gun cutoff is 18 U.S.C. 922(o). Implementing regulations are at 27 C.F.R. Part 479. The 2025 federal tax change is in P.L. 119-21.
Bump stocks - Garland v. Cargill (2024). In Garland v. Cargill, 602 U.S. 913 (2024), the U.S. Supreme Court held that a bump stock is not a "machinegun" under the National Firearms Act, striking down the federal regulation that had classified bump stocks as machine guns. As a matter of federal law, bump stocks are no longer NFA-regulated. State law may still independently restrict bump stocks; consult the RESTRICTIONS section for any Pennsylvania state-level provision.
P.L. 119-21 NFA tax (2026). Under P.L. 119-21 (signed July 4, 2025), the federal NFA making and transfer tax is reduced to $0 for suppressors, SBRs, SBSs, and AOWs, effective for calendar quarters beginning more than 90 days after enactment (first qualifying quarter January 1, 2026). Machine guns and destructive devices retain the $200 tax. The federal registration requirements (Form 1 or Form 4, fingerprints, photograph, CLEO notice) are unchanged.
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