Binary Trigger

A binary trigger — also called a release trigger — is a drop-in trigger that, in its binary mode, fires one round when you pull the trigger and a second round when you release it. Each shot is a separate, complete function of the trigger, and the device includes a selectable mode to return to standard semi-automatic operation. Popular for recreational and competition shooting, binary triggers are offered for AR-15, AK, Glock, and other platforms. Because legality varies, this page covers how they work and the important legal considerations. Browse our broader trigger selection, including drop-in match triggers.

Legal note first: binary trigger legality varies by state and locality, and some states prohibit them. Verify your state and local laws — and current federal guidance from the ATF — before ordering. Review our state restrictions page as a starting point.

Tatted Tacticals stocks binary triggers from established makers like Franklin Armory and Fostech, in selectable-mode designs for popular platforms.

How a Binary Trigger Works

A binary trigger has a selector with multiple modes, typically safe, standard semi-automatic, and binary. In binary mode, one round fires on the trigger pull and one on the controlled release — each round being a discrete, separate function of the trigger requiring your deliberate finger movement. It is not automatic fire; the firearm does not fire continuously while the trigger is held. The selectable design lets you switch back to ordinary semi-auto at any time. Most binary triggers are drop-in units that install in a standard AR-15 lower.

Legal Status and Responsibility

Under federal classifications, binary (release) triggers have generally been treated as firing one round per separate function of the trigger rather than as machine guns — but the law in this area is nuanced and several states and localities specifically restrict or ban binary triggers. You are responsible for knowing and following the laws in your jurisdiction. Always confirm current federal guidance from the ATF and your state and local laws before purchasing or installing one. Never use any trigger device in a manner contrary to law. Industry safe-handling resources are available from the NSSF, and you should always follow the four rules of firearms safety.

Binary Trigger — Frequently Asked Questions

What does a binary trigger do?

In binary mode, it fires one round when you pull the trigger and one when you release it, with each shot a separate, deliberate function of the trigger. It also includes a standard semi-automatic mode selectable at any time. It is not automatic fire — the firearm does not fire continuously while the trigger is held; each round requires a distinct finger movement, either a pull or a controlled release.

Is a binary trigger legal?

It depends on your location. Federally, binary triggers have generally been treated as firing one round per separate function of the trigger, but several states and localities specifically restrict or ban them, and the legal landscape can change. You must verify current federal guidance from the ATF and your specific state and local laws before purchasing or installing a binary trigger. Legality is determined by your jurisdiction.

Can a binary trigger go on a Glock?

Binary triggers are offered for several platforms, including AR-15, AK, and some pistol platforms like Glock, depending on the manufacturer’s product line. Compatibility and availability vary by maker and model. As with any binary trigger, you must confirm it’s legal in your jurisdiction before purchasing, since state and local laws govern these devices regardless of the platform they fit.

Is a binary trigger the same as automatic fire?

No. A binary trigger fires one round per separate function of the trigger — one on the pull, one on the release — each requiring your deliberate action. Automatic fire means continuous firing while the trigger is held, which a binary trigger does not do. This is a fundamental distinction. A binary trigger also includes a standard semi-auto mode you can select at any time.

Can you buy a binary trigger?

Where they are legal, yes — binary triggers are sold by established manufacturers. However, because several states and localities prohibit them and the legal landscape can change, you must confirm that binary triggers are legal in your jurisdiction and check current federal guidance before ordering. It is your responsibility to comply with all applicable federal, state, and local laws.