Are Binary Triggers Legal in Wyoming? A Guide to State &…

Are Binary Triggers Legal in Wyoming?

Yes, binary triggers are legal to own and install in Wyoming. The state has no specific laws prohibiting them. Their legality is determined by federal law, where the ATF classifies them as semi-automatic firearm accessories, not machine guns, because they fire only one round per function of the trigger.

Understanding Wyoming's Firearms Landscape

Wyoming maintains a reputation as one of the most gun-friendly states in the nation, a status reflected in its straightforward and permissive firearm laws. The state's legal framework is deeply rooted in a strong interpretation of the Second Amendment, often referred to as 'The Cowboy State's' commitment to self-reliance and the right to bear arms. Wyoming is a constitutional carry state, meaning residents who are legally allowed to possess a firearm can carry it concealed without a permit. This general approach of minimal state-level interference extends to firearm parts and accessories.

Unlike states with complex webs of regulations on magazine capacity, 'assault weapon' features, or specific trigger mechanisms, Wyoming's statutes are largely silent on such matters. The state legislature has consistently avoided creating a patchwork of local gun control measures, ensuring uniform laws statewide. This legislative environment means that for most firearm accessories, including binary triggers, the primary legal question isn't about Wyoming state law, but rather about federal law and the rulings of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF). For residents, this simplifies things: if an accessory is legal at the federal level, it is generally legal in Wyoming. This makes understanding the legal process of how to buy a firearm and its accessories relatively uncomplicated within the state's borders.

The Federal Definition: Why Binary Triggers Aren't Machine Guns

The core of the legality question for binary triggers rests on the federal definition of a 'machine gun' as established by the National Firearms Act (NFA) of 1934 and the Gun Control Act of 1968. Federal law, specifically 26 U.S.C. § 5845(b), defines a machine gun as any 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.' The key phrase here is 'a single function of the trigger.'

A standard semi-automatic rifle fires one round each time the trigger is pulled. To fire the next round, the trigger must be released to reset and then pulled again. A machine gun fires continuously as long as the trigger is depressed. A binary trigger operates differently from both. It fires one round on the pull of the trigger and a second, separate round on the release of the trigger. Because the pull and the release are two distinct and separate functions, the ATF has historically determined that these devices do not meet the legal definition of a machine gun. Each shot is tied to a specific, voluntary action by the shooter.

This interpretation has been clarified in multiple opinion letters from the ATF over the years. It's crucial to distinguish this from other devices. For example, this contrasts sharply with the much more complicated legal status of forced reset triggers (FRTs), which the ATF has reclassified as machine guns. The agency's reasoning is that an FRT's mechanism can result in a continuous firing cycle with constant rearward pressure, blurring the line of a 'single function.' Binary triggers, with their clear pull-and-release mechanic, have so far remained outside that classification.

How a Binary Trigger Functions Mechanically

To appreciate the legal distinction, it's helpful to understand what's happening inside the lower receiver. A standard AR-15 trigger group uses a hammer, trigger, and a single disconnector. When the trigger is pulled, it releases the hammer to strike the firing pin. As the bolt carrier group cycles, it pushes the hammer back down, where it's caught by the disconnector. Releasing the trigger allows the disconnector to hand the hammer off to the primary sear, resetting the mechanism for the next shot.

A binary trigger adds a second, or 'binary,' disconnector or sear to this system. The trigger selector has three positions: Safe, Semi-Automatic, and Binary. In 'Semi' mode, it functions exactly like a standard trigger. When switched to 'Binary' mode, the pull stroke works the same way, releasing the hammer. However, on the release stroke, the hammer is caught by the secondary disconnector. As the shooter releases the trigger forward, this secondary disconnector releases the hammer, firing the second shot. The shooter can always prevent the second shot by holding the trigger back and moving the selector back to 'Safe' or 'Semi' before release.

This mechanical design is fundamental to its legality. It ensures there are two distinct mechanical processes initiated by the shooter for two shots. This system is now available for many popular platforms like the SIG Sauer MPX, AK variants, and PCCs, all operating on the same legal principle. The reliability of these systems depends on proper installation and timing with the firearm's bolt cycle.

Wyoming Statutes vs. Federal Precedent

A direct review of Wyoming's state laws confirms the absence of any language that would restrict binary triggers. Wyoming Statutes, Title 6 (Crimes and Offenses), Chapter 8 (Weapons), contains the bulk of the state's firearm regulations. There are no prohibitions on rate of fire, specific trigger mechanisms, or cosmetic features often targeted by other states' 'assault weapon' bans. The state's legal definitions do not create a separate class for firearms equipped with such accessories.

Because Wyoming law does not provide a conflicting or more restrictive definition, the federal standard set by the ATF becomes the de facto law of the land within the state. This legal arrangement is common in states with strong firearm protections and is similar to the legal landscape in other pro-gun states like Arizona. This means that as long as a binary trigger manufactured by a reputable company like Franklin Armory or Fostech is sold with an accompanying ATF opinion letter confirming its status as a semi-automatic accessory, it is legal to purchase, own, and install in Wyoming. No special permits, registration, or tax stamps are required.

For residents looking to acquire a rifle suitable for such an upgrade, you can browse listings for compatible firearms available from sellers in your area. Installing a binary trigger is a modification, and while it changes the function, it does not change the legal classification of the host firearm itself. The rifle remains a Title I semi-automatic firearm, not a Title II NFA weapon. Knowing how to properly price your firearm, whether stock or modified, is also important; while a binary trigger adds cost, it doesn't inherently increase the firearm's base value for all buyers.

Practical Considerations and Safe Use in Wyoming

While possessing a binary trigger is legal in Wyoming, responsible ownership extends beyond mere legality. The increased rate of fire requires a higher level of skill to control, especially during rapid follow-up shots. A shooter must maintain a solid stance, grip, and sight picture to ensure all rounds impact the intended target. There is a learning curve, and mastering the pull-and-release cadence takes practice. Outrunning the bolt, where the hammer is released before the bolt is fully in battery, can cause a malfunction and is a common issue for new users.

Another practical consideration is the policy of local shooting ranges. Even though the device is legal, some privately owned or even public ranges may have rules that prohibit 'rapid fire' or the use of devices that facilitate it. This is often due to safety concerns or the potential for damage to target carriers and backstops. Always check the rules of the specific range you plan to visit before using a firearm with a binary trigger installed. Respecting range-specific rules is a key part of being a responsible member of the shooting community.

Finally, it is essential to stay informed about any potential changes in federal law or ATF interpretation. While the legal standing of binary triggers has been stable for years, regulatory landscapes can shift. Owners of these devices should keep abreast of rulings from the ATF to ensure they remain compliant. The legal principle is sound, but it is always wise to be a knowledgeable and proactive gun owner.