October 1, 2026 was supposed to be the day Connecticut became the third state to stop licensed dealers from selling America's most popular handgun design. Instead a judge halted the law before it took effect. The fight over machine gun convertible pistols is now the most consequential state-level battle in the firearms industry, and the three statutes driving it are nearly word for word copies of one another.
California's restriction took effect July 1, 2026. Connecticut's House Bill 5043, signed by Gov. Ned Lamont, was scheduled to begin October 1. Maryland's SB 334 starts January 1, 2027. All three target pistols lawmakers describe as machine gun convertible: semiautomatic handguns with a cruciform trigger bar that a person can readily convert to full automatic fire by replacing the slide backplate with an aftermarket pistol converter.
Maryland's statute carves out hammer-fired semiautomatics and striker-fired pistols that lack a cruciform trigger bar. It does not criminalize possession of a pistol a resident already lawfully owns, and it allows immediate family transfers under conditions. The Maryland State Police must adopt regulations and publish an official list of prohibited pistols, which had not yet appeared. The bill is also under challenge in federal court, so the practical answer for a dealer or a buyer is still a moving target.
The accessory driving all three laws is already illegal. A machinegun conversion device, commonly called a switch, has been unlawful to possess or install under federal law for decades. That is the argument the industry returns to at every hearing: the conduct these laws are aimed at is already a federal felony, while the statutes sweep in a class of ordinary firearms owned lawfully by millions of people. The pistols at issue include Glock-pattern handguns across several generations, which is why the bans land on a platform that dominates lawful defensive carry. If you want to see what the newest generation of that platform actually does on the range, our Glock 19 Gen 6 review walks through it.
When the National Shooting Sports Foundation sued over Connecticut's ban, Senior Vice President and General Counsel Lawrence Keane did not frame it as a technical drafting dispute. He argued the law punishes law-abiding owners and retailers rather than the people illegally modifying firearms, and the trade association filed both a motion for a preliminary injunction and a request for a temporary restraining order to keep the statute on hold.
All three bans are being litigated, and the first courtroom result came in Connecticut, where a federal judge blocked enforcement before the October 1 effective date. That ruling is the closest thing to a template the rest of the country has right now, and it is worth reading alongside the underlying statute rather than in place of it.
The Justice Department has also shifted from defending federal regulations to suing over state ones, filing challenges to California's AB 1127 and its handgun roster, and to Virginia's SB 749, which restricts semiautomatic rifle and magazine sales. The department separately expanded its San Jose action to take on a mandatory gun insurance requirement. Whatever a reader's view of the merits, the pattern is clear: these questions are being resolved by judges, not by legislatures or by the ATF.
For a licensed dealer in an affected state, the compliance questions are narrower than the headlines suggest. Which specific models appear on the state's prohibited list, whether the statute reaches advertising and display as well as sale, how private and family transfers are treated, and whether inventory bought before the effective date can still move. Connecticut's law, for example, has been described as covering sale, importation, distribution and advertising, which is a different set of obligations than a simple sales ban.
For a buyer, four things are true across all three states. The bans regulate commercial dealer sales, not possession of a firearm lawfully owned before the effective date. Each state treats private and family transfers differently, so the general rule is not a substitute for the statute. Federal background check requirements are untouched, and a standard Form 4473 transaction still applies. And a court order can change the answer in either direction with very little notice, so any purchase decision made on the eve of an effective date carries timing risk.
Read the statute and the state police guidance, not the summary. Where a prohibited-pistol list has not been published, there is no reliable way to know whether a specific model is covered. Gun owners and dealers in California, Connecticut and Maryland should assume the list will be narrower than the rhetoric and broader than they expect, and should get an answer in writing before money changes hands.
Sources: NSSF challenge to Connecticut HB 5043, Maryland State Police bulletin summary, reporting on the three-state pattern, and coverage of the DOJ lawsuits against state firearms laws.