Fostech Echo AR-II Drop-In Binary AR-15 Trigger



The Ultimate Guide to Echo Trigger: Enhancing Your Shooting Experience

Echo Trigger has revolutionized the way shooters handle their firearms, offering an advanced level of control and rapid fire capabilities without the complexities of full automatic systems. This comprehensive guide delves deep into the world of Echo Triggers, exploring their design, benefits, installation procedures, and much more.


The Echo Trigger is a specialized firearm component developed to enhance shooting efficiency and speed. Unlike standard triggers, the Echo Trigger employs a binary firing system that allows the gun to fire on both the pull and release of the trigger, effectively doubling the rate of fire. This feature makes it an attractive option for competitive shooters, tactical operators, and recreational firearms enthusiasts who seek to improve their shooting capabilities.

Design and Mechanics

Understanding the Echo Trigger

At its core, the Echo Trigger is ingeniously designed to offer both semi-automatic and controlled binary firing modes. The trigger mechanism consists of several key components:

  • Trigger Assembly: Houses the binary firing system.
  • Selector Switch: Allows the shooter to switch between semi-automatic and binary firing modes.
  • Disconnector: Ensures the firearm can only fire once per pull and release cycle.

How It Works

When activated in binary mode, the Echo Trigger allows a round to be fired upon pulling the trigger and another on its release. This system is designed to comply with ATF regulations by ensuring that each action of the trigger results in only one discharge.

Advantages of Using the Echo Trigger

The Echo Trigger offers numerous benefits that enhance shooting performance:

  • Increased Rate of Fire: Potentially doubles the number of rounds fired in the same amount of time as traditional semi-automatic fire.
  • Enhanced Control: Allows for quick follow-up shots without sacrificing accuracy.
  • Versatility: Suitable for various shooting activities, including sports, hunting, and tactical applications.

Scenarios of Use:

  • Competitive Shooting: Shooters can fire more rapidly, reducing time scores.
  • Tactical Applications: Enables law enforcement and security professionals to respond more effectively in critical situations.
  • Recreational Use: Adds an element of excitement and challenge for enthusiasts.

Installation Guide: Fostech Echo 2 Trigger

Tools Required

  • Screwdriver set
  • Punch set
  • Hammer

Installation Steps

  1. Ensure the Firearm is Unloaded: Safety first—make sure the firearm is completely unloaded.
  2. Remove Existing Trigger: Use the punch set to remove pins that hold the existing trigger in place.
  3. Install the Echo Trigger: Position the Echo Trigger in the slot and secure it with the previously removed pins.
  4. Function Test: Before reassembling, test the trigger functionality in both modes.
  5. Reassemble the Firearm: Once satisfied with the functionality, reassemble the rest of the firearm.

For visual learners, detailed installation videos can be found on Fostech’s official website.

Before installing an Echo Trigger, it’s crucial to understand the legal implications:

  • Federal Regulations: The ATF has specific guidelines that classify binary triggers differently from automatic firearms but restrictions can vary.
  • State Laws: Some states have stricter laws regarding binary triggers. Always check local laws to ensure compliance.

For more detailed information on legal considerations, consult resources such as the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).

User Reviews and Experiences

Feedback from users who have installed the Echo Trigger generally highlight improvements in firing rate and overall satisfaction with the performance upgrades. However, some users note a learning curve associated with mastering the binary firing mode.

Common Themes in User Feedback:

  • Improved Shooting Performance: Many report a significant enhancement in firing speed.
  • Installation Challenges: Some users find the installation process to be complex without proper guidance.

Pricing and Availability

The Echo Trigger is available for purchase through various online platforms:

Prices vary depending on the model and retailer, but generally range from $300 to $500. Comparatively, other binary triggers on the market might offer different features at similar price points.

Echo Trigger vs Binary Trigger

When comparing the Echo Trigger to other binary triggers like those from Rare Breed Triggers, it’s important to consider:

  • Functionality: Both types offer similar rapid-fire capabilities.
  • User Reviews: Echo Triggers tend to have higher user satisfaction in terms of reliability and ease of use.
  • Price: Pricing is competitive, though some models may offer more features at a higher cost.

Frequently Asked Questions

How to Install Fostech Echo 2 Trigger?

Follow the detailed installation steps outlined above, ensuring all safety checks are in place.

What is an Echo Trigger?

An Echo Trigger is a binary firing system that allows a firearm to discharge one round on pull and another on release of the trigger, enhancing the firing rate.


The Echo Trigger is a significant upgrade for any firearm enthusiast looking to enhance their shooting capabilities. With its advanced design, multiple benefits, and relative ease of installation, it offers a substantial improvement over traditional triggers. However, it’s essential to remain mindful of the legal landscape and ensure compliance with all regulations. With the right preparation and understanding, the Echo Trigger can be a game-changer in your shooting experience.


There are no reviews yet.

Be the first to review “Fostech Echo AR-II Drop-In Binary AR-15 Trigger”

Your email address will not be published. Required fields are marked *

Shopping Cart