Massachusetts Firearms Deadlines in October 2026: Serialization, Registration, and How to Avoid a Criminal Charge

By Attorney Joe Serpa | Georgetown University Law Center | Massachusetts Criminal Defense Since 1995

Massachusetts firearms owners face two separate compliance deadlines in October 2026. Much of the confusion about the two deadlines comes from treating them as one deadline. Under 501 CMR 20.00, the regulation implementing M.G.L. c. 140, § 121C, every firearm, frame, or receiver that lacks a serial number must be serialized by October 2, 2026.

Under section 157 of the 2024 gun law, firearms already possessed before the new registration portal came online must be registered through the portal by October 28, 2026. The Executive Office of Public Safety and Security (EOPSS) states the same deadline on its firearm modernization page.

The October 2 serialization date has passed. An owner who has not serialized and registered every firearm should finish both steps before October 28. An owner who misses either deadline can face a criminal charge, even though the owner’s possession was lawful before the deadline.

Massachusetts firearms penalties are severe. This post explains the source and requirements of each deadline, the penalty framework that applies when an owner fails to comply, and why most compliance cases can still end at the clerk-magistrate hearing without a criminal complaint.

A separate page explains how a Massachusetts case can be dismissed and why a dismissal leaves a defendant better protected than a plea that is not a conviction.

Chapter 135 of the Acts of 2024 and the 2026 Referendum

Governor Healey signed Chapter 135 of the Acts of 2024, An Act Modernizing Firearm Laws, on July 25, 2024. The act restructured the Commonwealth’s entire firearms code. Chapter 135 replaced the former assault weapon terminology with a broader assault-style firearm definition and expanded the definition of a firearm to include frames and receivers, finished or unfinished.

The act created an electronic registration system codified at M.G.L. c. 140, § 121B and imposed the serialization requirement of § 121C. Chapter 135 confirmed the license to carry as a single class of license, completing a consolidation that began when a 2014 law abolished the old Class B license.

The act broadened the extreme risk protection order framework of §§ 131R through 131Y. Chapter 135 also expanded the list of prohibited areas where firearms may not be carried even with a valid license. For the underlying offense framework, see Massachusetts Firearms Defense.

Opponents of Chapter 135 gathered signatures for a veto referendum. Under the ordinary rules, a certified referendum petition would have suspended the law until the election. On October 2, 2024, Governor Healey signed an emergency preamble that put the law into immediate effect and kept the petition from suspending it.

The referendum appears on the November 3, 2026 ballot as Question 9. A yes vote keeps Chapter 135, and a no vote repeals it going forward. What the vote does and does not change before election day is set out in Massachusetts Question 9 and the 2026 firearms referendum.

The pending vote changes nothing about present obligations. Chapter 135 is in force. The Commonwealth prosecutes a violation committed before the election under the law in effect at the time of the violation.

A later repeal would not retroactively legalize conduct that occurred while Chapter 135 was in force. An owner who waits for the November election before complying misses both deadlines, because both deadlines are in October.

Deadline One: Serialization by October 2, 2026

M.G.L. c. 140, § 121C requires that all firearms have a serial number, with limited exemptions that include firearms manufactured before October 22, 1968. The implementing regulation, 501 CMR 20.00, directs that anyone in possession of a previously manufactured or assembled firearm must serialize it by October 2, 2026. Chapter 135 expanded the definition of a firearm.

The serialization requirement therefore covers not only complete pistols, rifles, and shotguns but also frames, receivers, and unfinished frames or receivers, including 3D-printed frames and the 80 percent lowers sold for home completion. Compliance takes three steps. First, the owner requests a unique serial number from the Department of Criminal Justice Information Services through the state portal. Second, the owner has the serial number conspicuously and permanently engraved, cast, or embedded to a depth of at least .003 inches in a print size of at least one sixteenth of an inch. Third, the owner registers the serialized firearm in the owner’s name.

After the serialization deadline, possession of a non-serialized firearm, frame, or receiver is a criminal offense complete on possession alone. The owner of a privately made firearm who has taken no steps by the deadline is at particular risk, because the Commonwealth needs to prove no conduct beyond possession.

Deadline Two: Portal Registration by October 28, 2026

Chapter 135 created a statewide electronic registration system under M.G.L. c. 140, § 121B, which runs through the MIRCS Unified Gun Portal. Going forward, the registration deadline depends on the type of transaction. A dealer sale is recorded through the dealer at the transaction itself.

A private transfer must be reported within 7 days. A privately made firearm must be registered within 7 days of manufacture or assembly. A new resident must register the firearms brought into the Commonwealth within sixty days, and an heir who receives a firearm through an estate has sixty days to comply. For firearms already possessed before the portal came online in October 2025, section 157 of Chapter 135 sets the compliance date, giving owners one year from the point at which the registration system became publicly available. Section 157 does not name a date.

Section 157 requires that all firearms be registered not later than one year after the electronic firearms registration system is completed and publicly available. Section 158 sets the same one-year period for serialization, measured from the date the serial number request system is completed and publicly available. The fourth EOPSS guidance document on the act, issued November 13, 2025, gives inconsistent answers about the deadline. One answer in that document states that an owner is not required to register until October 2, 2026.

Another answer states that compliance with §§ 121B and 121C is not required until October 28, 2026. The Executive Office of Public Safety and Security states on its firearm modernization page that firearms must be serialized and registered by October 28, 2026. 501 CMR 20.08(1), however, requires serialization by October 2, 2026. Firearms already recorded through the prior FA-10 transaction system do not need to be re-registered. The EOPSS guidance states that there is no penalty for registering a firearm a second time.

The state has not applied the two October dates consistently in its own materials. The October 2, 2026 date has passed, so an owner who has not finished serialization and registration should complete both before October 28. The two deadlines are cumulative for the owner of an unserialized firearm in any event.

The serial number must exist by October 2, and the registration must be complete no later than October 28. For the owner of a conventional, serialized firearm never recorded in the FA-10 system, only the registration deadline applies. An owner whose firearms all passed through Massachusetts dealers with FA-10 records may have nothing to do at all. The owner should confirm that conclusion by checking the portal record, not by relying on memory of paperwork from years ago.

What Registration Does Not Cover

Registration under M.G.L. c. 140, § 121B establishes only that the Commonwealth has a record of the firearm. Registration does not establish whether a person may hold a license, whether a particular transfer is lawful, or whether a court has ordered the firearm surrendered. Different statutes govern licensing, transfers, and court-ordered surrender. Compliance with one statute does not satisfy the requirements of the others.

Licensing. M.G.L. c. 140, §§ 129B and 131 govern the firearm identification card and the license to carry. A registered firearm held by a person whose license has lapsed or been revoked is still unlawfully possessed. Registering a firearm neither restores nor extends a license. The licensing authority’s suitability determination under § 131 is also unaffected by the registration record.

Transfers. Transfers are reported through the portal on their own timelines. A dealer sale is recorded at the transaction itself, and a private transfer must be reported within 7 days. Registering a firearm once does not satisfy the reporting obligation when the firearm later changes hands.

Court ordered surrender. Court-ordered surrender is governed by a different body of law. A court may suspend a license and order surrender of all firearms and ammunition under an abuse prevention order, M.G.L. c. 209A, § 3B, or under a harassment prevention order, M.G.L. c. 258E, §§ 4A and 4B.

A court may take the same action under an extreme risk protection order, M.G.L. c. 140, §§ 131S and 131T. None of the three orders depends on Chapter 135, and none requires a criminal charge. A 258E harassment prevention order does not require a family or household relationship at all. License suspension and court-ordered surrender are covered in firearm surrender under a 258E harassment prevention order and in firearms after a domestic violence charge.

The Grandfathering Rules

Owners often confuse the two grandfather dates. Assault-style firearms lawfully possessed as of August 1, 2024, including copies and duplicates of the models identified in the Attorney General’s July 20, 2016 enforcement notice, remain lawful to possess under § 131M. Large capacity feeding devices are grandfathered only if lawfully possessed and manufactured before September 13, 1994. Grandfathered status protects possession, but it does not exempt the firearm from the serialization and registration requirements above. Grandfathered status also does not authorize carrying the firearm in the expanded prohibited areas.

Grandfathered status and the serialization and registration requirements are connected, because the grandfathering protection of § 131M applies to an assault-style firearm that has been registered and serialized in accordance with §§ 121B and 121C. An owner asserting grandfathered status should hold documentation of when the firearm was acquired, because in practice the owner must show the acquisition date at a licensing desk or at a hearing.

A Firearm Acquired or Inherited Years Ago

Owners who did nothing wrong face a difficult compliance problem under Chapter 135. Some owners received a firearm from a parent or a grandparent decades ago. Others bought a firearm before any electronic record existed, or have kept a firearm in a safe since long before the portal was built. Each of those owners faces the same two questions, whether the firearm is registered and whether the owner can prove the registration.

Section 157 contains no exception for an owner who never knew a record was required. The registration obligation applies to all firearms the person owns or possesses, whatever their origin. The compliance date is the same for every firearm. An heir who receives a firearm through an estate has sixty days to register it. The sixty-day rule applies to new inheritances, not to a firearm inherited years before the portal existed.

The practical steps are the same in every version of the problem. The owner should check the portal record rather than rely on memory. The owner should then register anything the record does not show, before the deadline rather than after. An owner whose firearm needs a serial number should follow the serialization process described above and keep a copy of the application. An owner who is uncertain whether a firearm is grandfathered should gather the documentation of when the firearm was acquired before a licensing authority or a prosecutor asks for it.

The April 2, 2026 Firearms Safety Course Requirement

Chapter 135 also changed the training required to obtain a license to carry or a firearm identification card. Under M.G.L. c. 140, § 131P, as amended by the Act, a basic firearms safety course completed on or after April 2, 2026 must follow a new curriculum approved by the Massachusetts State Police. The required subjects include the safe handling, use, and storage of firearms, childproofing methods, the Massachusetts laws governing possession, transportation, and storage, injury and suicide prevention, the law governing the use of force, and disengagement and de-escalation tactics.

The State Police regulations, 515 CMR 3.00, also require a live-fire component. A student must fire at least 20 rounds at distances of 3, 7, and 10 yards and must hit the target with every round. A certificate from a course completed before April 2, 2026 remains acceptable under the prior standards, so an applicant who already holds a valid safety certificate does not need to repeat the training.

The State Police Firearms Compliance Unit maintains the official list of approved courses. Some instructors have faced approval delays during the rollout of the new curriculum. An applicant should confirm that a course appears on the current approved list before enrolling, and should keep the completion certificate with the application records described in the compliance checklist below.

The Penalty Framework When Compliance Fails

Section 121B provides its own tiered penalties for registration violations. A first offense is punishable by a fine of up to $1,000. A second offense is punishable by a fine of up to $7,500, up to six months in jail, or both. A third or subsequent offense is punishable by a fine of up to $10,000, imprisonment for not less than one year and not more than five years, or both. The statute names no place of confinement, but a sentence of more than two and one half years cannot be served in a house of correction under M.G.L. c. 279, § 23.

A third or subsequent offense is therefore a felony under the rules that distinguish a misdemeanor from a felony in Massachusetts. The statute also allows suspension or permanent revocation of the violator’s firearms license. The registration and serialization provisions apply in addition to the existing penalty structure of M.G.L. c. 269, § 10. An owner who fails to comply therefore often faces more than one charge.

Unlicensed carrying of a firearm under § 10(a) is punishable by a mandatory minimum sentence of eighteen months. After Commonwealth v. Guardado, 491 Mass. 666 (2023), the absence of a license is an element the Commonwealth must prove beyond a reasonable doubt rather than a defense the accused must raise. Possession of a firearm or ammunition without the required identification card is separately charged under § 10(h), and possession of a large capacity firearm or feeding device is charged under § 10(m).

Improper storage is its own offense under M.G.L. c. 140, § 131L, which requires firearms to be secured in a locked container or equipped with a tamper-resistant lock when not under the owner’s control. Each statute defines a separate offense, so the police can file a complaint application listing several counts after a single encounter over an unregistered firearm. The police and the clerk-magistrate make the charging decision, even when the owner considers a violation technical.

The Prohibited Areas Problem

Carrying a firearm on school or college grounds has long been a separate offense under M.G.L. c. 269, § 10(j). The statute applies to elementary schools, secondary schools, and institutions of higher education, and covers license holders unless the institution has given written authorization.

Chapter 135 expanded the surrounding sensitive-places framework, adding locations such as government buildings where carrying is prohibited even with a valid license to carry. In Greater Boston, the campus rule alone covers the large colleges and universities in Cambridge, Somerville, and parts of Boston. A licensed carrier who crosses onto university property with a firearm commits a separate offense unrelated to the registration deadlines. The Commonwealth was already prosecuting campus carrying cases in the Boston Municipal Court and Cambridge District Court before the October deadlines.

A Practical Compliance Checklist

The compliance work is documentary. The documentation later becomes the defense file if anything goes wrong. Owners should work through the following before the deadlines, not in the final week.

The owner should inventory everything. The inventory should list every firearm, frame, receiver, and unfinished frame or receiver in the owner’s possession, with serial numbers where they exist. Under the expanded definition, a finished or unfinished frame or receiver kept in a box of parts in the basement is a firearm.

The owner should check the portal record. An owner who logs into the state portal can confirm which firearms already appear from prior FA-10 filings. The owner should verify in the portal, rather than assume, that a dealer purchase from years ago was recorded.

The owner should start serialization early. For anything without a serial number, the owner should request a serial number through the portal. Engraving to the required depth takes a gunsmith appointment. Gunsmiths will be busy in the final weeks before October 28.

The owner should save every portal confirmation, as a screenshot or a printout, for each serial number request and each registration. Dated proof of when the owner acted shows, at any later hearing, that the owner tried to comply.

The owner should follow the transport rules during compliance. Moving an unserialized frame to a gunsmith or a firearm to a dealer must itself comply with the transport rules, generally unloaded and in a locked case under M.G.L. c. 140, § 131C. During a routine traffic stop on the way to the gunsmith or dealer, a police officer may see the locked case in the back seat. The rules on when police can search a car in Massachusetts then apply directly to the owner. An owner should not commit a carrying offense while correcting a registration violation.

The owner should check the scope of their license. Chapter 135 changed what a firearm identification card (FID card) and a license to carry (LTC) each authorize. An FID holder who owns semiautomatic rifles or shotguns should confirm with counsel or the licensing officer whether the current license still covers what they own.

Heirs and new residents should calendar the sixty days. The sixty-day periods for heirs and new residents run from the event itself, not from the date the heir or new resident learns about the rule.

An Owner Who Has Already Missed a Deadline or Received a Notice

An owner who discovers a compliance failure after the fact should speak with counsel before taking the firearm anywhere or making any statement to police or licensing officials. Walking an unserialized frame into a police station to ask what to do creates a documented admission of the completed offense. In most cases the owner can still cure the violation. Proof that the owner completed serialization and registration helps the defense at any later hearing. The owner should plan the order of the cure with counsel rather than improvise at a service window.

An owner who has received a summons or show cause notice is at the stage where the clerk-magistrate can still decline to issue a complaint. The clerk-magistrate hearing is also dangerous for an owner who appears without a lawyer. Anything said at the hearing can be used later if a complaint issues. See I Received a Show Cause Notice in Massachusetts. What Do I Do? The Massachusetts clerk-magistrate hearing FAQ gives quick answers to the questions owners ask most often about the process.

Why Firearms Compliance Cases Start at the Clerk-Magistrate Hearing

Most Chapter 135 compliance violations involve previously lawful owners. These previously lawful owners are license holders who missed a deadline, misread the assault-style features test, or did not know that an unfinished frame counts as a firearm under Chapter 135. Owners in compliance cases are typically not arrested, so the case usually begins with an application for a criminal complaint and a summons to a clerk-magistrate hearing under M.G.L. c. 218, § 35A.

The clerk-magistrate hearing is the one stage at which the case can end with no complaint, no arraignment, and no CORI entry. On the defendant’s motion, a judge may dismiss a complaint that issued without the clerk-magistrate hearing, though the dismissal is without prejudice. Commonwealth v. DiBennadetto, 436 Mass. 310, 313-314 (2002). A denial at the hearing is not final either. In Cabrera v. Commonwealth, 496 Mass. 179 (2025), the Supreme Judicial Court held that collateral estoppel did not bar a second application filed two and a half years after a clerk-magistrate denied the first.

The Court reasoned that the denial was not a final judgment. The Court also held that the delay did not violate due process where the defendant made no showing of severe prejudice to the defense. Most denied applications are never brought again, but the outer limit is the statute of limitations for the offense, six years for most crimes. G. L. c. 277, § 63. The page on how Massachusetts criminal cases get dismissed explains the rules on dismissal.

The hearing is private and informal. The clerk-magistrate admits hearsay. The police report is usually the only evidence the police present. The accused has no right to cross-examine witnesses, though the clerk-magistrate may permit questioning in their discretion. Eagle-Tribune Publishing Co. v. Clerk-Magistrate of the Lawrence Division, 448 Mass. 647 (2007). The clerk-magistrate applies a probable cause standard, Commonwealth v. DiBennadetto, 436 Mass. 310 (2002), and holds discretion to decline the complaint even where that standard is met. Victory Distributors v. Ayer, 435 Mass. 136, 142 (2001).

In a compliance case, the defense presentation at the clerk-magistrate hearing consists of documents. The defense presents the portal serial number request, the registration confirmation, the gunsmith invoice, the licensing history, and the absence of any prior record. With those materials, the clerk-magistrate has a concrete basis to conclude that a criminal complaint is unnecessary because the owner has already complied. An owner who corrected the violation before the hearing appears before the clerk-magistrate having eliminated the conduct at issue.

The defense can also point to the genuine confusion caused by the emergency preamble, the portal rollout, and the pending referendum, as part of the argument that a criminal complaint is out of proportion to the violation. In a harder case, where a complaint issues and a judge later dismisses it, a documented compliance history helps the defendant under the standards Massachusetts judges apply to sealing and expungement petitions. Counsel also advises the client whether to speak at all, because statements made at an informal hearing can still be used later.

Courts Where Serpa Law Office Defends Firearms Cases

A possession or compliance offense is charged where the possession occurred, which for most owners means the District Court or Boston Municipal Court division covering their home. A carrying offense is charged in the court covering the location of the stop. For a closer look at how firearms cases proceed in a Boston Municipal Court division, see the office’s guide to firearms defense in the BMC Roxbury division. Serpa Law Office defends firearms charges and clerk-magistrate hearings in the following courts.

• Boston Municipal Court (all divisions, including Central, Brighton, Charlestown, Dorchester, East Boston, Roxbury, South Boston, and West Roxbury)
• Cambridge District Court
• Somerville District Court
• Newton District Court
• Brookline District Court
• Waltham District Court
• Malden District Court
• Woburn District Court
• Concord District Court
• Framingham District Court
• Dedham District Court
• Quincy District Court
• Hingham District Court
• For the full list, see Courts We Serve Across Greater Boston.

Key Takeaways

Two obligations apply. Unserialized firearms, frames, and receivers must be serialized by October 2, 2026 under 501 CMR 20.00, which implements M.G.L. c. 140, § 121C. Firearms already possessed before the portal launch must be registered by October 28, 2026. Section 157 of Chapter 135 sets a running period rather than a calendar date. The state firearm modernization page states that firearms must be serialized and registered by October 28, 2026. Firearms already recorded through the prior FA-10 system need not be re-registered.

Chapter 135 defines frames, receivers, and unfinished frames or receivers as firearms, so 80 percent lowers and printed frames fall under both deadlines.

Grandfathering protects possession of assault-style firearms lawfully possessed as of August 1, 2024 and of large capacity feeding devices manufactured before September 13, 1994, but it does not exempt the owner from serialization, registration, or the prohibited-areas rules. Under § 131M, the grandfathering protection for assault-style firearms applies to a firearm that is registered and serialized.

The surrounding penalty framework is severe. A third registration offense under § 121B is punishable by a fine of up to $10,000, imprisonment for not less than one year and not more than five years, or both. Unlicensed carrying under M.G.L. c. 269, § 10(a) is punishable by an eighteen-month mandatory minimum sentence. The absence of a license is an element the Commonwealth must prove. Commonwealth v. Guardado, 491 Mass. 666 (2023). Carrying on school or college grounds is separately criminal under § 10(j) even for license holders.

The November 3, 2026 referendum does not suspend Chapter 135. A repeal would not retroactively legalize violations that occurred while the law was in force.

The owner should save every portal confirmation. Dated proof of each compliance step shows a judge or a licensing authority that the owner tried to comply.

An owner who has missed a deadline or received a notice should speak with counsel before transporting anything or making any statement. Most compliance cases begin with a summons to a clerk-magistrate hearing. At that hearing, the clerk-magistrate may deny the application for a complaint on the basis of documented good-faith compliance, which ends the case before any CORI entry exists.

Serpa Law Office has defended Massachusetts firearms charges since 1995, from the clerk-magistrate hearing through trial, in the Boston Municipal Court and the district courts across Greater Boston. Contact Serpa Law Office at 617.936.0201 for a confidential consultation.

Related Serpa Law Office resources

• Massachusetts Firearms Defense
• Clerk-Magistrate Hearings in Massachusetts
• I Received a Show Cause Notice in Massachusetts. What Do I Do?
• Courts We Serve Across Greater Boston
• Arraignment in Massachusetts
• Massachusetts Criminal Records and CORI
• Illegal Searches and Seizures in Massachusetts
• Your Right to Remain Silent in Massachusetts
• Massachusetts Criminal Defense Results