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
October 2026 on GunPartPicker
Fostech Outdoors AR-15 AR II Echo Drop-In Binary Trigger ranked #72 of the 262 triggers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #111 of the 521 triggers builders have added. Builds with this trigger are split between 5.56 NATO (50%) and 300 Blackout (28%), split between mid-length (50%) and pistol-length (38%) gas systems, and mostly AR-15 (91%, then AR-9 10%).
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today all 4 retailers we track have it in stock. It dipped to $379.49 at KY Gun Company for a stretch in October 2026, under its usual $399.99, so sales do come around. Buying today, the lowest price is $296.40 at BattleHawk Armory, which matches the best price we saw in October.
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
Maxim Defense Industries Picatinny Rail Stock, PDW Style, Anodized Finish, Black, fits Picatinny
Spike's Tactical 5.56 NATO M16 Cut Lightweight AR-15 Bolt Carrier Group - Nickel Boron
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 builds →Builds in the community that include the Fostech Outdoors, Llc. Ar-15 Ar Ii Echo Drop-in Binary Trigger
| Build | Parts | Total |
|---|---|---|
 | 9 | $3906.36 |
 | 27 | $1996.70 |
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