Maryland's "Glock Ban" and the NRA v. Moore Lawsuit: What SB 334 Actually Does

A practical look at Maryland's "machine gun convertible pistol" ban and the federal challenge to it. In May 2026, Maryland enacted a new handgun restriction that gun-rights groups immediately challenged in federal court. The law does not use the word "Glock," but it is widely expected to capture standard Glock pistols and many Glock-pattern handguns because of the way it defines a "machine gun convertible pistol." Whether a specific model is covered will ultimately depend on the statutory definition, the Maryland State Police implementing regulations, and the prohibited-pistol list the agency must publish before the law takes effect. For Maryland gun owners, dealers, and anyone considering a handgun purchase before the restriction takes effect, the practical questions are immediate: What does the law prohibit? When does it take effect? Does it require anyone to surrender a pistol they already own? And what is the likelihood that the courts will block it before it is enforced? This article addresses each of those questions and explains where the litigation stands.

What Maryland SB 334 Does

Maryland Senate Bill 334, cross-filed in the House of Delegates as House Bill 577, was signed into law by Governor Wes Moore on May 26, 2026. The statute amends the Maryland Criminal Law Article to prohibit a person, on or after the law's effective date, from manufacturing, selling, offering for sale, purchasing, receiving, or transferring what the legislature has labeled a "machine gun convertible pistol."

The operative definition is technical, and it is the heart of both the law and the lawsuit. The statute defines a machine gun convertible pistol as a semiautomatic pistol with a cruciform trigger bar that can be readily converted, by hand or with common household tools, into a machine gun through the installation or attachment of a pistol converter that replaces the slide's backplate. The statute expressly excludes hammer-fired semiautomatic pistols and striker-fired semiautomatic pistols that lack a cruciform trigger bar.

That carve-out is what makes the law function in practice as a ban on many Glock and Glock-pattern pistols. The cruciform trigger bar is the defining internal design feature of the Glock pistol and of the many pistols built on the Glock pattern. The same converter the statute references is the device commonly known as a "Glock switch" or auto sear, an aftermarket part that is already illegal under both federal and Maryland law. By writing the prohibition around the internal trigger-bar geometry rather than naming a manufacturer, the legislature drafted a definition that is widely expected to reach standard Glock pistols and many Glock-pattern semiautomatic pistols that use the same design, while leaving most hammer-fired and non-cruciform striker-fired pistols untouched. The full scope, however, will depend in part on the prohibited-pistol list the Maryland State Police must publish before the law takes effect.

Which Pistols Are Affected

Because the statute keys on a design feature rather than a model list, the precise scope will not be fully settled until the Maryland State Police publish the list of prohibited pistols that the law requires them to produce. That implementation step matters: until the list is final, scope determinations at the margins remain uncertain, and that uncertainty is itself one of the practical problems the law creates for dealers and buyers. The plaintiffs in the federal lawsuit have characterized the ban as reaching nearly every Glock and Glock-style pistol on the market, and the breadth is central to their challenge. Standard Glock pistols use the cruciform trigger bar. So do numerous Glock-compatible pistols from other manufacturers, including designs marketed as Glock-pattern or Glock-clone handguns. The complaint specifically points to pistols such as the Palmetto State Armory Dagger, the Ruger RXM, and multiple Shadow Systems models as examples of firearms that share the relevant trigger-bar design and would likely be captured by the definition.

Current Owners Are Grandfathered

One point deserves emphasis because it is the source of considerable confusion: SB 334 does not require current lawful owners to surrender a covered pistol they already possess. The law instead targets future conduct — manufacturing, selling, offering for sale, purchasing, receiving, and transferring covered pistols on or after the effective date, subject to the statute's exceptions. For many Maryland residents, the practical effect is that a pistol you already lawfully own may remain lawful to possess, but the in-state market and transfer options for covered models will be sharply restricted once the prohibition takes effect. The statute does not confiscate; it cuts off lawful future acquisition and transfer within the state.

When the Law Takes Effect

The timing has been reported inconsistently in the press, so precision matters. The statute's prohibition on manufacturing, selling, purchasing, receiving, and transferring machine gun convertible pistols applies on or after January 1, 2027. That January 1, 2027 date is the operative deadline for the conduct the law actually bans, and it is the date that matters most for buyers, sellers, and dealers. Before that date arrives, the Maryland State Police are required to adopt implementing regulations and publish the list of prohibited pistols. A violation of the prohibition is a misdemeanor carrying a penalty of up to three years of imprisonment, a fine of up to five thousand dollars, or both.

The Legal Challenge: NRA v. Moore

Hours after Governor Moore signed the bill, the National Rifle Association, the Firearms Policy Coalition, and the Second Amendment Foundation filed a federal lawsuit challenging the law. The case is National Rifle Association of America v. Moore, No. 1:26-cv-02074, filed May 26, 2026 in the United States District Court for the District of Maryland. The plaintiffs are represented by the Washington, D.C. litigation firm Cooper & Kirk, PLLC. The complaint names Governor Moore, Maryland Attorney General Anthony Brown, and the acting Superintendent of the Maryland State Police as defendants, and it asks the court to declare the law unconstitutional and to enjoin its enforcement. A separate Maryland organization, Maryland Shall Issue, has indicated that it intends to file its own complaint, which would add a second front to the litigation.

The plaintiffs' central argument rests on the Supreme Court's 2008 decision in District of Columbia v. Heller, which struck down a handgun ban and held that firearms in common use for lawful purposes are protected by the Second Amendment. The complaint frames Glock and Glock-style pistols as among the most popular handguns in the United States, owned by millions of Americans and widely carried by law enforcement, and therefore squarely within the class of arms that Heller protects. The plaintiffs contend that the statute is, in effect, a handgun ban, and that targeting one popular category of handgun does not cure the constitutional defect. They also stress that the auto-sear converters the law invokes as its justification are already independently illegal, so the law burdens lawful owners of ordinary semiautomatic handguns rather than addressing conduct that is not already prohibited.

Maryland defends the law as a public-safety measure. The Governor's office has described the statute as giving the Maryland State Police a clear process to identify firearms that can be readily converted into fully automatic weapons, while preserving exceptions for law enforcement and other lawful uses. Supporters in the legislature argued that the measure targets the design feature that makes illegal conversion easy, and that the state has a legitimate interest in limiting the supply of pistols that can be turned into functional machine guns with a cheap, illegal part. The legal question the court must resolve is whether a semiautomatic handgun that is lawful to own, but that can be illegally modified, can be prohibited consistent with the Second Amendment as interpreted in Heller and in the Supreme Court's more recent decision in New York State Rifle & Pistol Association v. Bruen.

It is worth being clear about what a court win would and would not mean. A successful challenge would not automatically erase every Maryland restriction touching semiautomatic pistols or machine-gun conversion devices. The central issue in NRA v. Moore is whether Maryland may ban this category of ordinary semiautomatic handguns based on their design and convertibility, even though the conversion devices the state is worried about are already illegal. In other words, the lawsuit is about the handgun ban, not about legalizing auto sears or machine-gun conversions.

The California Parallel — and Why It Is Not a Roadmap

Maryland is not the first state to enact a restriction of this kind. California adopted a comparable ban on machine gun convertible pistols, and New York included a similar restriction in its 2026-27 state budget. The same gun-rights organizations now suing Maryland previously challenged the California law, but they agreed to drop that suit in April 2026. That matters: because the California challenge was dismissed rather than litigated to a controlling decision, it is not a live roadmap the Maryland court must follow. The Maryland case will rise or fall on the record built in the District of Maryland and on how the United States Court of Appeals for the Fourth Circuit approaches Second Amendment claims after Bruen, an area where the Fourth Circuit's approach has not been uniformly favorable to challengers.

What Happens Next in the Litigation

The most important near-term question is not whether the case will ultimately succeed, but whether the plaintiffs can obtain a preliminary injunction before the prohibition takes effect on January 1, 2027. A lawsuit of this kind will not be fully resolved on the merits in the months between filing and the effective date. To prevent the ban from being enforced in the interim, the plaintiffs will need to persuade the district court to issue preliminary relief, which requires showing a likelihood of success on the merits, irreparable harm in the absence of relief, and that the balance of equities and the public interest favor an injunction. The number of Maryland residents affected, the common-use argument drawn from Heller, and the structure of the post-Bruen analysis all give the plaintiffs a plausible basis for that motion. Whether a particular district judge grants it is far less predictable, because trial courts within the Fourth Circuit have not applied the post-Bruen framework uniformly in firearms cases.

For Maryland residents tracking this closely, the practical timeline is straightforward. Absent a preliminary injunction, the prohibition becomes enforceable on January 1, 2027, and the Maryland State Police prohibited-pistol list and implementing regulations will appear in advance of that date. If an injunction issues, enforcement could be paused while the case proceeds. Either way, this litigation is likely to continue well beyond the effective date, and the plaintiffs have signaled that they are prepared to pursue the matter to the Supreme Court if necessary.

What Maryland Gun Owners Should Take Away

• No confiscation of already-owned covered pistols. SB 334 does not require current lawful owners to surrender a covered handgun they already possess.
• The real change is future acquisition and transfer. On and after January 1, 2027, Maryland bars the manufacture, sale, offer for sale, purchase, receipt, and transfer of covered pistols, subject to the statute's exceptions.
• Do not guess about scope from social media. The Maryland State Police must publish a prohibited-pistol list, and that list — not a general description of the law — will determine whether a specific model is covered.
• The lawsuit does not freeze the law by itself. Unless a court issues a preliminary injunction, the law remains on track to take effect.
• If you are planning a purchase or transfer, timing matters. Decisions made close to an effective date can carry real criminal consequences, so individualized legal advice is worth getting before you act.

Frequently Asked Questions

Does Maryland's new law ban Glocks?

Functionally, it comes close. SB 334 does not name Glock, but it bans "machine gun convertible pistols" defined as semiautomatic pistols with a cruciform trigger bar that can be converted with a backplate-replacement device. That definition is widely expected to capture standard Glock pistols and many Glock-pattern pistols, while excluding hammer-fired pistols and striker-fired pistols without a cruciform trigger bar. The exact scope will depend on the prohibited-pistol list the Maryland State Police must publish.

Do I have to give up a Glock I already own in Maryland?

No. Current owners are grandfathered. The law restricts manufacturing, selling, purchasing, receiving, and transferring covered pistols going forward; it does not require you to surrender a pistol you already lawfully own.

When does the Maryland Glock ban take effect?

The prohibition on manufacturing, selling, purchasing, receiving, and transferring covered pistols applies on or after January 1, 2027. Before that date, the Maryland State Police must adopt implementing regulations and publish a list of prohibited pistols.

Is the law being challenged in court?

Yes. The NRA, Firearms Policy Coalition, and Second Amendment Foundation filed a federal lawsuit, NRA v. Moore, in the U.S. District Court for the District of Maryland the same day the bill was signed. The suit seeks to have the law declared unconstitutional and its enforcement blocked. Unless a court issues a preliminary injunction, the law remains on track to take effect.

How do I know if my specific pistol is banned?

The full scope depends on the prohibited-pistol list the Maryland State Police must publish before the law takes effect. Standard Glock pistols and many Glock-pattern pistols from other makers are expected to be covered. Watch for the official list and seek individualized legal advice for a specific firearm.

How This Office Can Help

For Maryland residents, dealers, and prospective buyers trying to evaluate whether a specific pistol is covered, whether a planned acquisition or transfer can be completed before the effective date, or how Maryland restrictions interact with federal firearms law, my office advises on Maryland and federal firearms law, including National Firearms Act matters and gun trusts. This is also part of a broader pattern of shifting state firearms law — neighboring Virginia's "assault" firearms ban takes effect July 1, 2026 — and as the Maryland State Police implementing regulations and prohibited-pistol list are published, and as the NRA v. Moore litigation develops, I will continue to track the practical consequences for Maryland gun owners.