Fostech Echo AR II Drop In Binary AR-15 Trigger
Original price was: $450.00.$370.00Current price is: $370.00.
The Echo AR-II Trigger is a groundbreaking drop-in design that is approved by the ATF. The Echo AR-II trigger does not come with a bolt carrier.
PRODUCT DETAILS:
- PATENTED Design that gained ATF Approval (Patent # US 8,820,211 B1)
- PATENTED Technology licensed through Franklin Armory inside the Echo AR-II Trigger, including U.S. Pat. Nos. 9,952,012 and 9,952,013.
- Technology licensed through HIPERFIRE inside the Echo Trigger
- Light, clean, and crisp pull in Semi-Automatic Mode
- The Echo Trigger is packed full of cutting edge technology
- Reliable function in Echo Mode
Now Available!
Legal To Own And Purchase!
Prices are discounted until the end of: 11th August 2026
Buy this Trigger privately from us with no ATF transaction records! Pay securely using cryptocurrency (Bitcoin BTC or Ethereum ETH) or 3rd-party payment methods at checkout.
The Fostech Echo AR II is a drop-in binary trigger for the AR-15. In its binary (Echo) mode it fires one round when you pull the trigger and one round when you release it, and it also offers standard semi-automatic and safe modes. Each round is fired by a separate function of the trigger, so it remains a semi-automatic system.
Legality: binary triggers are legal under federal law, but several states restrict or ban them. Confirm your state and local laws before buying. You must be of legal age and eligible under federal, state, and local law to purchase.
Specifications and fitment
| Spec | Detail |
|---|---|
| Platform | AR-15 (semi-automatic) |
| Trigger type | Drop-in binary trigger |
| Modes | 3 (Safe / Semi / Echo binary) |
| Binary firing | One round on pull, one on release |
| Bolt carrier group | Standard semi-auto AR-15 |
| Manufacturer | Fostech |
Controlled speed, easy install
The Echo AR II’s binary mode lets you increase your rate of fire in a controlled, predictable way, while the standard semi mode keeps things simple when you want it. It is a true drop-in that works with a standard AR-15, making installation straightforward. If you are still narrowing things down, it sits alongside the rest of our trigger collection so you can weigh the options side by side.
It is one of the most popular fast-cycling options in the full range of AR-15 triggers we stock, and it ships ready to install.
Frequently asked questions
Is the Fostech Echo AR II legal? Binary triggers are legal under federal law, but states such as California, New York, New Jersey, Washington and others ban or restrict them. Always confirm your state and local laws before purchasing.
Does it need a special bolt carrier? No. The Echo AR II runs with a standard semi-automatic AR-15 bolt carrier group.
How does it compare to other fast triggers? If you are cross-shopping rate-of-fire options, the Wide Open Trigger is a close alternative; the Echo AR II stands out for its three selectable modes and simple drop-in fit.
Ready to run it? Add the Fostech Echo AR II to your cart above.
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