The Constitutional Hearing Protection Act amends the Internal Revenue Code and Title 18 to take silencers (also called firearm mufflers) out of the definition of 'firearms' in IRC section 5845(a), adds a new subsection to §5841 treating silencers possessed in accordance with Title 18 chapter 44 as satisfying National Firearms Act (NFA) registration and licensing requirements, and requires the Attorney General to destroy existing silencer registration and related transfer/make application records. The bill also amends Title 18 to define 'firearm silencer' and a device 'keystone part,' requires licensed importers and manufacturers to mark the keystone part with a serial number (with a variance process), and preempts state or local taxes, marking, recordkeeping, or registration requirements on silencers other than generally applicable sales or use taxes.
Why it matters: the bill shifts the statutory footing for silencers from the Internal Revenue Code's NFA scheme toward regulation under Title 18 while attempting to preserve federal serial-number marking and uniformity. It would erase federal silencer registration records, constrain state-level regulation and taxation, and impose new marking obligations on manufacturers and importers — changes that affect owners, industry, law enforcement, and state governments in different and sometimes competing ways.
At a Glance
What It Does
The bill strikes silencers from the IRC definition of firearms (IRC §5845(a)), adds §5841(f) to treat Title 18 chapter 44 compliance as meeting NFA registration/licensing, mandates destruction of federal silencer registration and application records, adds definitions and marking rules to Title 18, and preempts certain state taxes and marking/registration laws for silencers.
Who It Affects
Current NFA silencer owners, licensed importers and manufacturers, federal law enforcement and the ATF, and state and local governments that tax or regulate silencers. Retailers and interstate shippers of silencers will see changes to state compliance obligations and to federal marking/identification rules.
Why It Matters
The bill creates a national, uniform federal approach to silencers that narrows state authority and erases a federal registry while keeping a federal serial-numbering requirement — a combination that alters traceability, taxation, and the compliance burden for industry and enforcement alike.
More articles like this one.
A weekly email with all the latest developments on this topic.
What This Bill Actually Does
The bill first alters the Internal Revenue Code by removing the parenthetical 'any silencer' from the statutory definition that underpins the NFA (IRC §5845(a)). That change takes silencers out of the IRC’s enumerated list of NFA items.
At the same time, the bill adds a new §5841(f) saying that a person who acquires or possesses a silencer in accordance with chapter 44 of Title 18 will be treated as meeting all NFA registration and licensing requirements for that silencer. In short, the bill moves the regulatory locus away from the Internal Revenue Code’s NFA framework toward Title 18 regulation, while purporting to preserve the effect of registration/licensing through cross-reference.
On the criminal-law side, the bill adds explicit statutory definitions for 'firearm silencer' and a 'keystone part' in 18 U.S.C. §921(25). The keystone part is a single externally visible component without which a working silencer cannot be assembled; interchangeable mounting pieces are carved out.
Licensed importers and manufacturers must mark that keystone part with a serial number engraved or cast on it, under a regulation process administered by the Attorney General. If a silencer lacks a clearly identifiable keystone part or has multiple such parts, manufacturers can request a marking variance; the bill instructs the Attorney General to grant such requests except for 'good cause.'The bill also adds a limited federal preemption to 18 U.S.C. §927: states and localities may not impose taxes (other than general sales or use taxes), marking, recordkeeping, or registration requirements on silencers that 'affect interstate or foreign commerce.' Complementing that preemption, the Attorney General must destroy existing silencer registrations and related transfer/make applications maintained in the National Firearms Registration and Transfer Record within 365 days of enactment.
Finally, the bill includes a technical rule of construction saying the legislation does not place formerly NFA-regulated firearms under the Consumer Product Safety Commission’s jurisdiction. The effective date language ties the primary IRC amendment to calendar quarters beginning more than 90 days after enactment, and the destruction requirement has a one-year deadline.
The Five Things You Need to Know
The bill strikes the phrase '(7) any silencer' from IRC §5845(a), removing silencers from that statutory list of NFA items.
It adds IRC §5841(f), which says possessing a silencer in compliance with Title 18 chapter 44 will be treated as satisfying all NFA registration and licensing requirements.
It amends 18 U.S.C. §921 to define 'firearm silencer/firearm muffler' and creates the statutory concept of a 'keystone part' — the single externally visible component required to assemble a working silencer.
Licensed importers and manufacturers must mark the keystone part with an engraved or cast serial number; if a device lacks a clear keystone part, they may seek a marking variance from the Attorney General, who must grant it except for 'good cause.', The Attorney General must destroy any federal registration or transfer/make-application records identifying silencer makers or transferees in the National Firearms Registration and Transfer Record within 365 days of enactment.
Section-by-Section Breakdown
Every bill we cover gets an analysis of its key sections.
Remove silencers from the Internal Revenue Code NFA list
This provision deletes the statutory phrase that expressly lists 'any silencer' as an NFA item under IRC §5845(a). Practically, that removes silencers from the statutory bucket that has governed NFA taxation, registration and transfer procedures under the Internal Revenue Code, creating the need for a parallel mechanism — which the bill supplies in §5841(f). The immediate legal effect is a reclassification in statutory text; administrative implementation will determine how taxes and forms tied to the NFA are adjusted in practice.
Treat Title 18 compliance as satisfying NFA obligations
The new subsection says anyone who acquires or possesses a silencer 'in accordance with chapter 44 of title 18' will be treated as meeting 'all registration and licensing requirements of the National Firearms Act' for that silencer. That language attempts to bridge the gap left by removing silencers from the IRC list: owners following Title 18 will not be considered noncompliant with NFA registration/licensing. The provision raises implementation questions about recordkeeping, tax remittance, and how ATF will reconcile existing NFA procedures with Title 18 regulatory forms.
Preempt state and local taxes and marking/registration rules on silencers
This adds an express limitation to §927: state or local laws that impose taxes (other than generally applicable sales or use taxes) or require marking, recordkeeping, or registration of silencers affecting interstate or foreign commerce "shall have no force or effect." The preemption is narrow in scope — it targets certain fiscal and information-collection measures — and therefore invites litigation over whether other state approaches (licensing fees, safety inspections framed differently, or local ordinances regulating possession) fall inside or outside the bar.
Attorney General must destroy federal silencer registration and related applications
Within 365 days of enactment, the Attorney General must destroy any silencer registration maintained in the National Firearms Registration and Transfer Record and any transfer-or-make application that identifies silencer transferees or makers. This is an affirmative, time-certain command to remove identifying records from the federal registry, with implications for owner privacy, historical traceability, and ongoing or future investigations that rely on those records.
Definitions, interstate-transfer language, and marking requirements
The bill inserts a new paragraph (25) into 18 U.S.C. §921 that defines 'firearm silencer' and 'keystone part,' and amends §§922(b) and 923(i). The §923 change bifurcates treatment: licensed importers/manufacturers must mark the keystone part with a serial number in a form prescribed by the Attorney General, but may request a marking variance where the part is not clearly identifiable. The Attorney General is directed to grant a variance absent 'good cause.' These mechanics create a federal serial-numbering regime for silencers while leaving the Attorney General discretion over marking rules and variances.
Preserve exclusion from Consumer Product Safety Commission jurisdiction
The bill includes an explicit rule of construction disavowing any transfer of formerly NFA-regulated firearms to the jurisdiction of the Consumer Product Safety Commission. That limits potential administrative reclassification of silencers as consumer products, keeping oversight within firearms law rather than CPSC product-safety regimes.
This bill is one of many.
Codify tracks hundreds of bills on Criminal Justice across all five countries.
Explore Criminal Justice in Codify Search →Who Benefits and Who Bears the Cost
Every bill creates winners and losers. Here's who stands to gain and who bears the cost.
Who Benefits
- Existing silencer owners and privacy advocates — the bill requires destruction of federal silencer registration and identifying transfer/make applications, removing a centralized federal record that linked owners to particular silencers.
- Licensed importers and manufacturers — the bill creates a uniform federal marking standard (with a variance process) and a national preemption of certain state taxes and registration regimes, reducing multistate compliance complexity for moving product across state lines.
- Retailers and interstate shippers of silencers — by preempting state-level taxes and registration requirements (other than general sales/use tax), the bill reduces the patchwork of subnational rules that can impede interstate commerce in silencers.
Who Bears the Cost
- Manufacturers and importers — they must engrave or cast serial numbers on the statutory 'keystone part' and absorb marking, production line, and compliance costs; where a keystone part is unclear they must manage variance requests and potential delays.
- State and local governments — the preemption clause removes a stream of regulatory and fiscal levers (special taxes, registration/marking requirements) that some jurisdictions currently use to regulate silencers and raise revenue.
- Federal law enforcement and the ATF — the Attorney General and ATF must implement new marking regulations, process marking-variance petitions, and execute a one-year program to destroy existing registration and application records, while adjusting investigative practices that relied on the NFRTR data.
Key Issues
The Core Tension
The central dilemma is between creating uniform federal treatment and owner privacy (removing silencer records, narrowing state rules) versus preserving investigatory traceability and state-level regulatory tools: the bill attempts to protect owners from federal and state registries while keeping a federal marking regime, but those aims pull in opposite directions for enforcement and state authority.
The bill combines several moving parts that point in different directions. Removing silencers from the IRC NFA list while adding a cross-reference that Title 18 compliance satisfies NFA requirements creates a statutory re-routing rather than a clean repeal: how taxes, transfer forms, and routine ATF procedures migrate from the IRC framework to Title 18 is left to regulation.
The marking rule — serial numbers on a statutory 'keystone part' — preserves a degree of traceability, but the narrow statutory definition of keystone part (and the carved-out treatment of interchangeable mounting parts) invites both design workarounds and litigation over what qualifies for a variance. The Attorney General's duty to grant variances "except on showing good cause" sets a permissive baseline but gives the executive branch meaningful discretion over implementation.
The destruction of federal silencer records is the most consequential operational change: it favors owner privacy and erases a historical investigative source. That step will help owners concerned about a public or centralized registry, but it will also reduce law enforcement's ability to trace silencers by registration history and could complicate unresolved criminal matters.
Finally, the preemption language is targeted — it bars certain taxes and marking/registration schemes but leaves room for states to use other regulatory tools. Expect legal disputes about the contours of 'affecting interstate commerce' and what counts as a tax or fee excluded from the preemption, producing uncertainty for states, businesses, and courts.
Try it yourself.
Ask a question in plain English, or pick a topic below. Results in seconds.