For the AR-15 enthusiast looking to enhance their shooting experience, a binary trigger offers a unique and exciting function. Unlike traditional semi-auto triggers that fire one round per pull, a binary trigger fires a shot both when you pull the trigger and when you release it. This allows for a significantly faster rate of fire with improved control compared to other methods, making it popular for recreational shooting and dynamic drills.
Choosing the right binary trigger, however, requires careful consideration. Factors like compatibility with your specific AR-15 platform, reliability, and the feel of the trigger itself are paramount. This roundup examines eight of the best binary triggers available, from industry-leading names to specialized options, to help you find the perfect component for your build. We will also cover a basic installation guide to ensure you can get your new trigger set up safely and correctly.
Our Top Picks for AR-15 Binary Triggers
- Echo C450000060 Trigger Genuine OEM Part
- Franklin Armory BFSIII AR-C1 Binary Firing System
- Fostech Echo AR-II Binary Trigger Gen 2
- Franklin Armory BFSIII AR-S 22LR Binary Trigger
- Franklin Armory BFSIII 9mm Glock Compatible Binary Trigger
- WOT Binary Trigger for AR-15 / M16
- Franklin Armory BFSIII BINARY FLAT FACE TRIGGER
- Double Tap Tactical AR-15 Binary Trigger
Echo C450000060 Trigger Genuine OEM Part
As a genuine Original Equipment Manufacturer part, this trigger is the foundation for the popular Fostech Echo system. It is designed for reliability and seamless integration, ensuring that it meets strict factory specifications. This makes it an excellent choice for those who value OEM quality and need a dependable core component for their build or repair project.
The manufacturer part number C450000060 guarantees you are getting an authentic piece, which is crucial for performance and safety. This trigger is often sought by owners looking to maintain the integrity of their Fostech-based systems or for custom builds where a proven, high-quality trigger group is required.
Franklin Armory BFSIII AR-C1 Binary Firing System
The Franklin Armory BFSIII AR-C1 is a flagship binary trigger system renowned for its robust construction and intuitive operation. It features a selector with three distinct positions: safe, semi-auto, and binary. This design allows for quick transitions between firing modes, giving the shooter flexibility depending on the situation.
Built to military specifications, the BFSIII is known for its durability and reliable performance even under rapid fire. Its widespread popularity is a testament to its design, offering a crisp pull and a positive reset that makes achieving a fast, controlled rate of fire both easy and consistent.
Fostech Echo AR-II Binary Trigger Gen 2
The Fostech Echo AR-II Gen 2 represents an evolution of the original Echo trigger, incorporating user feedback and design refinements. This generation maintains the unique “echo” function but often features improvements in the internal mechanism for smoother operation and enhanced reliability. It is a direct competitor known for its distinct feel and performance.
Installation is straightforward for those familiar with AR-15 lower receivers, and the system is engineered to work with a wide range of standard components. The Echo AR-II Gen 2 is a solid choice for shooters who appreciate a well-engineered, purpose-built binary trigger from a trusted name in the industry.
Franklin Armory BFSIII AR-S 22LR Binary Trigger
Specifically engineered for .22LR AR-15 platforms, the Franklin Armory BFSIII AR-S brings the binary experience to rimfire shooting. This is an ideal option for high-volume, low-cost training and plinking. It offers all the fun and functionality of a binary trigger without the high ammunition expense of centerfire calibers.
The system is designed to work with .22LR conversion kits and dedicated upper receivers, providing a seamless fit and reliable operation. If you want to practice your rapid-fire skills or simply maximize enjoyment with your .22LR AR, this specialized trigger is an outstanding solution.
Franklin Armory BFSIII 9mm Glock Compatible Binary Trigger
Expanding the binary trigger concept beyond the AR-15 platform, this pack is designed for 9mm rifles that accept Glock-style magazines. It brings the rapid-fire capability of the BFSIII system to the popular pistol-caliber carbine (PCC) market. This allows for a unique and exciting shooting experience with a 9mm AR.
Compatibility is key with this model, as it is built to work with lowers designed for Glock magazines. It maintains the same three-position selector and reliable binary operation, making it a must-have upgrade for owners of 9mm AR-platform rifles seeking enhanced performance.
WOT Binary Trigger for AR-15 / M16
The WOT Binary Trigger offers a more budget-conscious entry into the world of binary firing systems. It provides the core binary function—firing on both the pull and release—making it an accessible option for shooters who want to experience this technology without a premium investment.
Despite its competitive positioning, it is constructed to deliver the fast-paced shooting that binary triggers are known for. For those building a fun-range rifle or experimenting with a binary trigger for the first time, the WOT trigger presents a compelling value proposition.
Franklin Armory BFSIII BINARY FLAT FACE TRIGGER
This version of the celebrated BFSIII system features a modern flat-faced trigger shoe. Many shooters prefer a flat trigger for its consistent finger placement and often a cleaner, more linear pull. It combines the proven reliability of the Franklin Armory binary mechanism with this popular ergonomic upgrade.
The flat face can help reduce trigger finger fatigue during extended shooting sessions and provides a distinct tactile feel compared to traditional curved triggers. If you appreciate the benefits of a flat trigger shoe, this model brings that advantage directly to the binary firing experience.
Double Tap Tactical AR-15 Binary Trigger
The Double Tap Tactical AR-15 Binary Trigger is another contender in the market, focusing on providing a straightforward binary function. Its name highlights the core action of the system—firing one round when you “tap” the trigger and another when you release it.
This trigger is built for AR-15 platforms and aims to deliver a reliable and fun shooting experience. It serves as an alternative for enthusiasts looking to compare features and performance among the various binary trigger options available from different manufacturers.
What to Look For in the Best AR-15 Binary Triggers
Choosing the right binary trigger for your AR-15 isn’t just about picking the first one you see. It’s about finding the component that fits your shooting style, your budget, and your rifle’s setup. I’ve spent a lot of time testing these, and a few key factors always separate the good from the great.
First, consider the reset mechanism. This is the heart of how a binary trigger works. Some models use a mechanical reset, where the physical movement of the trigger sliding forward prepares the second shot. Others use an inertial reset, which relies on the bolt carrier group cycling to reset the trigger. Mechanical resets are often perceived as more consistent, especially if you’re shooting slowly or from an unstable position, while inertial designs are perfectly reliable during rapid fire.
Next, think about build quality and materials. You’re putting a high-speed component into your firearm, so it needs to be tough. Look for triggers made from heat-treated or tool-grade steel. The finish should be smooth and durable to resist wear and corrosion. A cheap, poorly machined trigger will not only feel gritty but could also be a safety concern over time.
Ease of installation is another big one. Some binary triggers drop in almost like a standard trigger group, while others require specific hammers, disconnectors, or even slight modification to your lower receiver. If you’re not comfortable with detailed gunsmithing, a more straightforward, drop-in unit is the way to go. This is a core part of getting your 8 Best AR-15 Binary Triggers in 2025 [Installation Guide] set up correctly and safely.
Finally, don’t ignore the safety selector. A good binary trigger will come with a dedicated, multi-position safety selector that clearly delineates between safe, semi-automatic, and binary modes. The clicks should be positive and unmistakable. You never want to be unsure of what mode your rifle is in. The best selectors are intuitive and prevent accidental engagement of the binary function.
By weighing these factors—reset type, build quality, installation complexity, and safety design—you can make a smart choice that enhances your shooting experience without compromising on reliability or safety.
FAQ
Are binary triggers legal?
This is the most important question, and the answer is: it depends entirely on your local and state laws. At the federal level, binary triggers are generally considered legal because they require a separate and distinct pull and release of the trigger to fire two rounds, which does not meet the definition of a “machine gun” under the National Firearms Act (NFA). However, several states and even some municipalities have explicitly banned them. It is your responsibility to know and understand the laws in your area before purchasing or installing one.
How does a binary trigger work?
A binary trigger creates a two-stage firing cycle. When you pull the trigger, it fires one round just like a standard semi-automatic. The key difference is on the release. When you consciously release the trigger forward, it fires a second round. So, the sequence is: pull (bang), release (bang). This allows for a much faster rate of fire than standard semi-auto, but it is not full-auto, as it still requires two distinct mechanical actions per two rounds fired.
Is it difficult to install a binary trigger?
The difficulty varies by model. Some are designed as true “drop-in” units that replace your entire fire control group and are installed as a single assembly, which is relatively straightforward. Others require you to replace individual components like the hammer and disconnector separately, which can be trickier and requires more familiarity with the AR-15’s lower receiver. Always follow the manufacturer’s specific 8 Best AR-15 Binary Triggers in 2025 [Installation Guide] instructions precisely. If you’re unsure, having a qualified gunsmith do the installation is a wise investment.
Can I use a binary trigger with any ammunition?
Technically, yes, but reliability can vary. Binary triggers are mechanical devices that must cycle in sync with your rifle’s action. Underpowered ammunition may not generate enough gas to cycle the bolt carrier group completely, which can cause a failure to reset the trigger, resulting in a “dead” trigger on the release. For the most reliable performance, I recommend using full-power, brass-cased ammunition that you know cycles reliably in your specific rifle.
Will a binary trigger damage my AR-15?
Not directly. A binary trigger itself won’t cause damage, but the increased rate of fire it enables can lead to more rapid wear on other components and will put more heat stress on your barrel and bolt. It’s a good idea to ensure your rifle is properly lubricated and that you’re using a bolt carrier group and barrel rated for sustained fire if you plan on doing a lot of binary trigger shooting.