Ghost Gun Laws by State: Your 80% Builds and Compliance

"Ghost guns" — firearms assembled from components that individually don't meet the federal definition of a firearm — have been the subject of substantial state and federal regulatory attention over recent years. For collectors who have built personal firearms from 80% receivers, lower parts kits, or specific component combinations, the regulatory landscape has evolved significantly and continues to evolve. Understanding what federal and state requirements apply to self-built firearms, and specifically how state requirements vary, is important for collectors with builds in their inventories.

This article provides general orientation to the ghost gun regulatory landscape. It is not legal advice, and specific situations require consultation with qualified counsel in the specific state. Federal and state frameworks continue to evolve through regulation, legislation, and litigation; specific current provisions should be verified against current sources. What follows helps collectors understand the general framework so they can identify specific questions warranting professional consultation.

The Federal Framework

Federal regulatory attention to privately-made firearms has increased through ATF rulemaking and specific enforcement actions.

ATF Frame and Receiver Rule

ATF regulatory action has addressed the definition of "firearm frame or receiver" and related definitions that govern when specific components become regulated firearms. The specific regulatory framework affects what components can be sold without FFL processing, what assembly processes create regulated firearms, and how specific builds interact with federal requirements.

The specific regulatory details have been subject to litigation and regulatory modification. Current federal framework requires verification against current regulations rather than relying on older understandings.

Privately Made Firearms

Federal framework includes specific treatment of privately-made firearms (PMFs) — firearms that individuals manufacture for personal use without commercial intent. PMFs have specific treatment under federal law that differs in some respects from commercially manufactured firearms.

The specific treatment includes considerations for manufacturing for personal use (generally not requiring FFL licensing for the builder), subsequent transfer (specific treatment applies), and serialization (specific requirements may apply depending on specific circumstances).

Kit Definitions

Federal regulatory attention has focused on when specific kits or component combinations constitute firearms under federal definitions. Kits that are "readily convertible" to functioning firearms may fall within specific definitions that require FFL processing for sale; kits that don't meet the definitions may be sold more freely.

The specific "readily convertible" standard and its application have been subject to regulatory interpretation and litigation. Current application should be verified against current regulatory guidance.

State-Level Variations

State-level ghost gun regulation varies substantially across jurisdictions, from states with no specific state-level regulation (deferring to federal framework) to states with comprehensive ghost gun regulatory frameworks.

States with Comprehensive Frameworks

Some states have enacted comprehensive ghost gun regulatory frameworks including specific requirements such as:

Serialization requirements for self-built firearms. Registration of self-built firearms. Restrictions on specific components or kits. Licensing requirements for specific building activities. Specific penalties for non-compliance.

States with comprehensive frameworks typically require self-builders to serialize, register, or otherwise formally document their builds within specific timeframes. Non-compliance with these specific requirements can produce specific criminal liability.

States with Partial Frameworks

Other states have enacted partial frameworks addressing specific aspects of ghost gun regulation — serialization requirements but not registration, restrictions on specific components but not general building, specific penalties for specific activities. The partial frameworks produce specific compliance obligations for specific activities while leaving other activities under federal-only framework.

States Without State-Level Regulation

Many states don't have state-level ghost gun regulation beyond what federal law provides. In these states, federal framework governs, and state-specific requirements don't add to the federal obligations. Collectors in these states still face federal requirements for specific activities but don't face state-level additional requirements.

Common State-Level Provisions

Serialization Requirements

Serialization requirements are among the most common state-level ghost gun provisions. Specific states require self-built firearms to carry serial numbers that can be traced. The specific serialization requirements — format, timing, registration with specific agencies — vary by state.

For collectors with self-built firearms in states with serialization requirements, compliance involves ensuring each build has appropriate serialization before the state-specific deadlines. Non-serialized builds in serialization-required states may be unlawfully possessed regardless of when they were built.

Registration Provisions

Some states require registration of self-built firearms in addition to serialization. Registration typically involves providing specific information to state agencies (typically state police) within specific timeframes after building. Registration documentation may be required for subsequent transfers or specific other activities.

Restrictions on Specific Components

Some states restrict specific components associated with ghost gun building — specific unfinished receivers, specific kits, specific other components that could be used for building without serialization. The restrictions may include sales prohibitions, possession restrictions, or specific other limitations.

Building Activity Restrictions

Some states restrict specific building activities — requiring specific licensing for building, restricting who can build firearms, requiring specific documentation of building activities. The specific restrictions vary substantially by state.

Transfer Considerations

Transfer of Self-Built Firearms

Self-built firearms face specific transfer considerations under both federal and state frameworks. Federal law typically requires FFL processing for transfers of self-built firearms (subject to specific exemptions); state law may add specific requirements.

Inheritance of Self-Built Firearms

Inheritance of self-built firearms involves the same general estate administration framework as other firearms, with specific considerations for serialization and registration status. Self-built firearms without proper serialization (where required) may face specific challenges in estate distribution.

Interstate Movement

Interstate movement of self-built firearms follows federal interstate transfer requirements plus specific state requirements in the destination state. Items lawful in the departure state may face specific restrictions in the destination state; collectors moving should verify specific destination state provisions.

Common Build Categories

AR-Platform Builds

AR-platform builds from 80% lowers are among the most common self-build categories. The specific regulatory treatment of AR-platform builds depends on the specific state — some states regulate them as assault weapons subject to specific provisions, some don't; some states regulate them through ghost gun frameworks, some don't.

Handgun Builds

Handgun builds from 80% frames (specific polymer frame platforms, specific other handgun platforms) face specific regulatory treatment in some states. The specific treatment may include assault weapon provisions (where the handgun falls within state definitions), specific handgun provisions, or specific ghost gun provisions.

Other Platform Builds

Other platform builds (specific rifle platforms, specific shotgun builds, specific other firearms) may have specific regulatory treatment depending on state frameworks. Verifying specific items against specific state provisions prevents assumption-based compliance errors.

Documentation Considerations

Build Records

Maintaining detailed records of self-built firearms supports compliance in multiple contexts. Records typically include:

Build date and specific components used. Acquisition records for each component (where applicable). Serialization applied (where applicable or required). Registration documentation (where applicable). Photographs of the completed build and specific identification features.

The inventory system can organize build records alongside general firearm records, supporting ongoing management and specific compliance activities.

Serialization Documentation

For builds with serialization (whether voluntary or required), documentation of the specific serialization — how it was applied, when it was applied, what it consists of — supports subsequent activities. Serialization that's later challenged or questioned needs documentation to support its validity.

Component Acquisition Records

Records of component acquisitions establish that specific components were acquired through proper channels at proper times. This documentation becomes important if questions arise about the legitimate origin of specific components.

Specific Compliance Scenarios

Pre-Regulation Builds

Builds completed before specific state regulations took effect may have specific grandfathering provisions under those regulations. The specific grandfathering terms and documentation requirements vary. Pre-regulation builds documented with specific acquisition and build dates may qualify for grandfathering; undocumented builds may face challenges demonstrating their pre-regulation status.

Compliance Conversion

Some collectors with builds that don't meet current state requirements can bring them into compliance through specific actions — adding required serialization, completing required registration, specific other actions. The specific conversion path varies by state and by specific item characteristics.

Disposition Considerations

For builds that can't be brought into compliance in the collector's state — or that the collector chooses not to retain — disposition options include transfer to states where the items are compliant, specific modifications that remove specific characteristics, or specific disposal through appropriate channels.

Planning Considerations

Pre-Build Compliance Analysis

Before initiating self-build projects, understanding specific state requirements for the specific planned builds prevents building items that face specific compliance obligations the builder didn't anticipate. The time invested in pre-build compliance analysis typically saves substantial effort later.

Ongoing Compliance

State frameworks continue to evolve. Builds that were compliant when completed may face new requirements through subsequent legislation. Periodic review of compliance status — particularly after legislative changes — catches requirements that might otherwise be missed.

Multi-State Considerations

Collectors whose activities involve multiple states need to verify compliance in each relevant state. Items compliant in one state may face different provisions elsewhere; transfers across state lines may trigger specific requirements.

Estate Planning

Self-built firearms in estates warrant specific planning attention. Heirs may face specific requirements to receive the items; specific items may face specific transfer restrictions; specific documentation may support or complicate transfers. Planning with qualified counsel addresses these considerations.

Qualified Counsel for Complex Situations

The complexity of ghost gun regulation — intersecting federal and state frameworks, evolving regulatory environment, specific item-specific provisions — produces situations where qualified counsel engagement provides substantial value. For collectors with significant self-build activity, ongoing counsel relationships produce better outcomes than case-by-case consultation.