Are Binary Triggers Legal in Maine? A Guide to State Law

Are Binary Triggers Legal in Maine?

Yes, binary triggers are currently legal to purchase, own, and install in Maine. State law does not specifically prohibit them, and they do not meet Maine's legal definition of a 'machine gun,' which requires multiple shots from a single function of the trigger.

Understanding the Legal Landscape in Maine

The question of binary trigger legality is a hot topic for firearm owners across the country, and Maine is no exception. With a complex web of federal rulings and state-specific statutes, getting a straight answer can be difficult. The simple answer is that binary triggers are not prohibited under current Maine law. They occupy a legal gray area in many jurisdictions, but Maine’s statutes are relatively clear in how they define illegal automatic firearms, and binary triggers do not fit that definition.

This legality hinges on a very specific mechanical function. A binary trigger fires one round when the trigger is pulled and a second round when the trigger is released. Because each round requires a distinct action—a pull or a release—it is not considered a machine gun under federal or Maine law, which defines a machine gun as firing more than one shot with a *single function* of the trigger. This article will break down the specific state statutes, the federal position, and what Maine gun owners need to know.

The Core Mechanism: Why a Binary Trigger Isn't a Machine Gun

To grasp the legal argument, you first have to understand the mechanics. A standard semi-automatic rifle fires one round for every pull of the trigger. The trigger must then be released and pulled again to fire another round. A fully automatic firearm, or machine gun, fires continuously as long as the trigger is held down. This continuous fire from a single trigger pull is the key legal definition.

A binary trigger sits in a unique middle ground. It has a three-position selector: Safe, Semi-auto, and Binary. In binary mode, pulling the trigger fires one round, just like a standard semi-automatic. However, the mechanism also fires a second round upon the *release* of the trigger. This pull-and-release sequence results in two shots, but it requires two separate actions from the shooter's finger. The Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) has historically affirmed that because one of these actions is the release, it does not count as a single function. Therefore, most binary trigger designs are not classified as machine guns under the National Firearms Act (NFA).

Analyzing Maine's Specific Firearm Statutes

The most important document for this discussion is the Maine Revised Statutes. Specifically, Title 17-A, §1051 defines a 'machine gun.' The law states a machine gun is a weapon that 'shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger.' This language is critical. It mirrors the federal definition found in the NFA.

Because a binary trigger requires both a pull and a release to fire two rounds, it performs two functions, not one. This is the argument that has kept them legal at the federal level and, by extension, in states like Maine that use the same definitional framework. Maine has not passed any specific legislation to ban 'rate-of-fire-enhancing devices' or to specifically name binary triggers as illegal. Unlike states with stricter gun control, Maine's laws are focused on the classic definition of a machine gun, leaving devices like binary triggers outside of that scope.

It's also worth noting the contrast with other trigger mechanisms. For example, the legal status of forced reset triggers is far more contentious, with the ATF classifying them as machine guns. You can read about the complexities in our guide covering forced reset triggers legality in Florida, which highlights the nuanced ATF interpretations that can vary between devices.

Federal Oversight and the ATF's Stance

While state law is paramount, the federal position provides the foundation. The ATF has issued several opinion letters over the years regarding specific binary trigger models from manufacturers like Franklin Armory and Fostech. In these letters, the agency has consistently found that these devices do not meet the definition of a machine gun. However, the ATF's position can be fluid. Their reclassification of bump stocks as machine guns after the 2017 Las Vegas shooting shows that regulatory interpretations can change, sometimes rapidly.

For now, the approved designs remain legal under federal law. Maine gun owners should be aware that this federal approval is essential for their legality within the state. If the ATF were to reverse its position and reclassify binary triggers as machine guns, they would immediately become illegal NFA items in Maine, subject to strict regulation and registration, unless state law provided some form of protection, which is unlikely. Staying informed on federal firearms news is crucial for anyone who owns these devices. Our American Gun Trader blog is a valuable resource for staying up-to-date on such developments.

Practical Advice for Owners in Maine

If you own or are considering purchasing a binary trigger in Maine, there are several practical steps to take. First, always keep the ATF approval letter that came with your trigger. This documentation proves your device is a federally recognized legal accessory. Second, never modify the internal components of the trigger. Altering the mechanism could inadvertently create a device that *does* fire more than one round per function, which would be an illegal machine gun.

When you're ready to purchase a firearm to host your new trigger, it's important to follow all state and federal guidelines; our guide on how to buy a gun provides a clear roadmap for the process. Furthermore, be mindful of how such a modification can impact the firearm's worth. While some buyers seek out these upgrades, others prefer stock configurations, which can affect its overall value. Understanding how to properly value a firearm is key before investing in significant aftermarket parts.

Finally, always use the firearm responsibly at the range. The rapid-fire capability can be surprising to others and may draw unwanted attention. Always follow range safety rules and be a good ambassador for the Second Amendment community. Many gun owners in Maine enjoy the unique functionality these triggers provide on popular platforms found in our firearms listings, particularly AR-15 style rifles.

How Maine Compares to Other States

Maine’s permissive stance on binary triggers stands in stark contrast to many other states, including some in the region. States like California, New York, New Jersey, and Florida have explicitly banned binary triggers and similar rapid-fire devices. For example, the legal battle in the Golden State is intense, as detailed in our analysis of whether binary triggers are legal in California. These states often have broader definitions of 'machine gun' or specific statutes targeting trigger modifications.

Conversely, many other states, particularly in the Midwest and Mountain West, follow Maine's approach. They defer to the federal definition and have not passed state-level prohibitions. This creates a patchwork of laws across the U.S. where a legal accessory in one state can be a felony in another. For residents of Maine, this means any travel with a firearm equipped with a binary trigger requires careful research of the laws in your destination state.