Fostech Outdoors AR-15 AR II Echo Drop-In Binary Trigger
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Fostech
Overview
The Fostech Outdoors AR-15 AR II Echo Drop-in Binary Trigger is a binary trigger designed to enhance your shooting experience by allowing the firearm to fire once on pull and again on release. This feature can significantly increase your rate of fire, making it a popular choice for builders looking to create a more dynamic shooting platform. It is commonly found in mid-length gas system builds chambered in 5.56 NATO, where quick follow-up shots are essential.
Specifications
Available Merchants(4)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have been adding the Fostech Outdoors AR-15 AR II Echo Drop-In Binary Trigger to their builds on GunPartPicker since February 2026. All time, it ranks #117 of the 495 triggers builders have added. Builds with this trigger are split between 5.56 NATO (56%) and 300 Blackout (31%), split between mid-length (50%) and pistol-length (38%) gas systems, and mostly AR-15 (95%).
Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today all 4 retailers we track have it in stock. Prices barely moved in September 2026, holding around $379.49, so there haven't been real sales lately. Buying today, the lowest price is $379.49 at KY Gun Company, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
Sharps Bros Showdown Stripped Lower Receiver - Black, Unique Design and High-Performance for Custom AR Builds - SBLR11
Bravo Company Manufacturing 5.56 NATO Mid-Length Bhf AR-15 Barreled Upper - MCMR-15 - 16"
Magpul AFG-2 Angled Fore Grip - Black
Aero Precision AR-15 Breach Charging Handle Ambidextrous Small Levers
Spike's Tactical 5.56 NATO M16 Cut Lightweight AR-15 Bolt Carrier Group - Nickel Boron
Maxim Defense Industries Picatinny Rail Stock, PDW Style, Anodized Finish, Black, fits Picatinny
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
PlatformBased on real build data showing which platform (AR-15, AR-10, AR-9) builders pair with this product.
CaliberBased on real build data showing which calibers builders choose alongside this product.
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
Builds Featuring This Part
See all 2 →Builds in the community that include the Fostech Outdoors, Llc. Ar-15 Ar Ii Echo Drop-in Binary Trigger
| Build | Parts | Total |
|---|---|---|
 | 9 | $3978.29 |
 | 27 | $2091.05 |
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