The Massachusetts firearm registration system should not be treated as a determination that a firearm is lawful for you to possess.
The ability to enter or register a firearm in the system does not, by itself, establish that the firearm or your possession of it is lawful under Massachusetts law.
Massachusetts separately regulates firearm licensing, semiautomatic firearms, large-capacity firearms, assault-style firearms, feeding devices, serialization, prohibited persons, restricted locations and other possession issues.
Before registering a firearm, determine whether you may lawfully possess that firearm under current Massachusetts law.
This page is intended for general educational and informational purposes only. It may not address every statute, regulation, court decision, agency interpretation, exemption or individual circumstance.
This information is not legal advice and should not be relied upon as a substitute for consultation with a qualified attorney or review of the current controlling law.
Massachusetts Firearm Registration
Massachusetts now requires firearms possessed, manufactured or assembled in the Commonwealth to be registered through the electronic firearm registration system maintained by the Department of Criminal Justice Information Services.
The primary registration statute is M.G.L. c. 140, §121B.
Registration procedures are further addressed in 501 CMR 19.00.
1. Registration Enforcement Date
The Commonwealth currently states that individuals must begin complying with the firearm registration and serialization requirements of M.G.L. c. 140, §§121B and 121C on or before October 28, 2026.
The registration and serialization systems are already live through the MIRCS Unified Gun Portal.
2. What Does Massachusetts Require?
M.G.L. c. 140, §121B requires firearms possessed, manufactured or assembled in Massachusetts to be registered through the Commonwealth's electronic firearm registration system, unless a specific statutory exclusion applies.
The registration record includes information such as:
- the registrant's name and contact information;
- firearm license, card, permit or exemption information;
- firearm type;
- date acquired;
- source from which the firearm was obtained;
- whether the firearm is privately made; and
- an attestation under the pains and penalties of perjury concerning the registrant's licensing or exemption status and firearm possession eligibility.
3. Registration Is Not Approval of the Firearm
Registration should not be confused with a determination that:
- the firearm is lawful to possess;
- the registrant's firearm license authorizes the firearm;
- the firearm is not an assault-style firearm;
- the firearm is not large-capacity;
- the associated feeding device is lawful;
- the firearm satisfies serialization requirements; or
- the firearm may lawfully be carried or transported.
Each of those issues can require a separate legal analysis.
4. Registration and Serialization Are Different
| Registration | Serialization |
|---|---|
| Governed primarily by M.G.L. c. 140, §121B. | Governed primarily by M.G.L. c. 140, §121C. |
| Records the firearm and registrant in the Massachusetts system. | Concerns whether the firearm bears a qualifying identifying serial number. |
| Procedures are addressed by 501 CMR 19.00. | Procedures are addressed by 501 CMR 20.00. |
| Does not substitute for serialization. | Does not substitute for registration. |
5. When Must a Firearm Be Registered?
Section 121B ties registration to events such as:
- import into Massachusetts;
- purchase;
- acquisition;
- manufacture; and
- assembly.
6. New Massachusetts Residents
Section 121B provides that a firearm imported by a new resident must be registered within 60 days.
7. Firearms Acquired Through an Estate
A firearm acquired by an heir or devisee through distribution of an estate may generally be registered within 60 days under §121B.
The recipient must separately determine whether Massachusetts licensing and possession requirements allow continued possession.
8. Privately Made Firearms
A privately made firearm manufactured or assembled in Massachusetts must be analyzed under both:
- M.G.L. c. 140, §121B — registration; and
- M.G.L. c. 140, §121C — serialization.
Section 121B provides a seven-day registration period for a privately made firearm after manufacture or assembly.
9. Buying From a Massachusetts Firearm Dealer
Massachusetts currently states that a customer purchasing a firearm from a Massachusetts firearm dealer does not separately register that dealer purchase.
The dealer records the transaction through the applicable Massachusetts electronic system.
10. Firearm Retailer Obligations
Massachusetts firearm retailers have separate registration, transaction-reporting and recordkeeping responsibilities.
The dealer records applicable firearm sales and transfers through the Massachusetts electronic transaction system.
A firearm imported into Massachusetts by a licensed dealer, gunsmith, distributor or manufacturer is subject to a 7-day registration period unless the firearm is transfered within that 7 days..
Applicable dealer inventory must be handled through the dealer registration and transaction system in accordance with current Massachusetts requirements.
Retailers dealing with firearms that require Massachusetts serialization must separately review §121C and 501 CMR 20.00.
Dealer sales and transfers can create Massachusetts transaction reporting obligations in addition to federal FFL recordkeeping.
Dealer inventory losses or thefts can create separate state and federal reporting obligations.
11. Private Sales and Transfers
Section 121B requires firearm transactions within Massachusetts to be reported through the electronic firearm registration system.
Transactions can include:
- sales;
- rentals;
- leases;
- loans; and
- other transfers.
The statute requires applicable transaction reporting within 7 days.
12. Firearms Obtained Outside the Dealer System
M.G.L. c. 140, §128B separately addresses Massachusetts residents who purchase or obtain a firearm from a source other than a licensed Massachusetts dealer or a person authorized under §128A.
The statute requires those firearms to be registered and the information required under §§121B and 121C to be reported.
Section 128B also applies to certain nonresidents who receive such a firearm within Massachusetts.
13. Electronic Transaction System
M.G.L. c. 140, §128A requires firearm purchases, sales and transfers covered by that section to be conducted through the electronic firearm registration system before or at the point of sale.
The system is designed to review submitted information and display whether the seller may proceed with the sale or transfer.
14. Previously Registered Firearms
Mass.gov currently states that firearms previously registered or transactions previously recorded do not need to be entered again solely because the new portal is now operational.
15. Lost or Stolen Firearms
Section 121B requires the owner of a lost or stolen firearm to report the loss or theft through the electronic firearm registration system within 7 days.
The report must include identifying information concerning the firearm.
16. Statutory Registration Exclusions
Section 121B contains specific circumstances in which the registration requirement does not apply.
These include certain firearms:
- delivered to law enforcement solely for destruction;
- possessed by qualifying common carriers during ordinary transportation for licensed customers;
- possessed by individuals lawfully traveling through Massachusetts in the care and custody of a nonresident owner, subject to storage rules;
- owned by the United States government; and
- produced by federally licensed manufacturers and not for sale in Massachusetts.
17. Nonresidents
Registration requirements for nonresidents depend heavily on why the firearm is in Massachusetts and what statutory exemption applies.
Current EOPSS Guidance #5 states that a nonresident lawfully traveling in or through Massachusetts, or possessing qualifying rifles or shotguns under specified §129C exemptions, is not required to register the firearm.
The underlying licensing, firearm type, semiautomatic status, large-capacity status, assault-style classification and activity still matter.
18. Frames and Receivers
Massachusetts' current definition of firearm includes qualifying frames and receivers.
Registration requirements can therefore apply even where the item is not yet a complete firearm.
19. Registration Does Not Cure an Assault-Style Firearm Issue
M.G.L. c. 140, §131M separately governs possession and transfer of assault-style firearms.
An owner relying on a statutory possession exception must separately satisfy the conditions imposed by that law.
20. Registration Does Not Cure a Large-Capacity Issue
Large-capacity firearm and large-capacity feeding-device rules are also separate from registration.
A firearm's registration status does not establish that:
- the firearm is lawful for the registrant's license type;
- a feeding device is lawful;
- a large-capacity firearm is lawful to carry or transport; or
- the configuration complies with other Massachusetts restrictions.
21. Registration Does Not Replace Licensing
A person must separately possess the firearm licensing authority or statutory exemption required by Massachusetts law.
The registration statute itself requires a registrant to attest under penalties of perjury that the person is properly licensed, permitted or exempt and is not otherwise prohibited from owning or possessing a firearm.
22. Failure to Register or Report
Section 121B establishes escalating penalties for failure to register a firearm or report a required transaction, loss or theft.
| Violation | Statutory Penalty |
|---|---|
| First offense | Fine of up to $1,000. |
| Second offense | Fine of up to $7,500, imprisonment up to 6 months, or both. |
| Third or subsequent offense | Fine of up to $10,000, imprisonment from 1 to 5 years, or both. |
The statute also states that failure to report can be cause for suspension or permanent revocation of a person's firearm license, card or permit.
23. Before You Register
Handgun, rifle, shotgun, frame, receiver, unfinished frame or privately made firearm.
Determine whether your LTC, FID, nonresident credential or statutory exemption authorizes possession.
Semiautomatic firearms can raise separate licensing issues.
Determine whether the firearm or feeding device falls within Massachusetts large-capacity definitions.
Registration does not establish lawful possession under §131M.
Determine whether the firearm already has a valid serial number or requires Massachusetts serialization.
A previously registered firearm does not need to be registered again solely because the new portal is live.
Purchase, private transfer, import, inheritance, manufacture, assembly, loss or theft.
24. GOAL Registration Guidance
GOAL recommends that firearm owners treat registration as only one part of Massachusetts firearm compliance.
Before entering a firearm into the system, separately determine:
- whether you may lawfully possess the firearm;
- whether your license authorizes it;
- whether the firearm is semiautomatic;
- whether it is large-capacity;
- whether it is an assault-style firearm;
- whether a feeding device creates a separate issue;
- whether serialization is required;
- whether the firearm was already registered; and
- whether a dealer or another party has already recorded the transaction.
Primary Sources
- M.G.L. c. 140, §121B — firearm registration.
- M.G.L. c. 140, §121C — firearm serialization.
- M.G.L. c. 140, §128A — purchases, sales and electronic transaction procedures.
- M.G.L. c. 140, §128B — firearms obtained outside specified dealer/authorized-sale channels.
- 501 CMR 19.00 — Massachusetts firearm registration regulations.
- 501 CMR 20.00 — Massachusetts serialization regulations.
- Mass.gov — Record a Private Firearms Sale or Registration
- Mass.gov — Firearms License & Transaction FAQ
- EOPSS Guidance #5 — 2024 Firearms Act
Current Commonwealth guidance identifies October 28, 2026 as the date individuals must begin complying with the registration and serialization requirements.
Because Massachusetts firearm law and agency implementation can change, verify the current statute, regulations and official guidance before relying on this page.