FosTech Echo AR-II Drop-In Trigger

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0.10 LBS
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Echo AR-II Drop In Trigger For The AR-15 Rifle is one of the most advanced safety triggers on the market. With safety and dependability in mind the Echo AR-II Drop In Trigger features three different settings: Safe, semi-automatic and echo modes. With its' unmatched technology the Echo AR-II Drop In Trigger afr an AR-15 is made from a patented design that has been approved by the ATF.


  • Patented Design that gained ATF Approval
  • Light, clean, and crisp pull in Semi-Automatic mode
  • Packed full of cutting edge technology that includes HiperFire technology and FosTecH's secondary disconnect
  • Reliable and dependable Function
  • No proprietary carrier group need with The Echo AR II 6
  • Drop in Cassette design


  • Finish: Metallic
  • Fabric/Material: Proprietary Stainless Steel Alloy
  • Gun Model: AR-15
  • Gun Type: Most AR-15s
  • Trigger Shape: Traditional Curved
  • Trigger Pull Weight: Range 4.5 - 5 lb
  • Color: Stainless Steel

WARNING This product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to You must be 18+ years old to shop and or purchase on our website and 21+ to purchase Ammunition/Firearms. Check local laws before ordering as you certify you are of legal age and satisfy all federal, state, and local legal/regulatory requirements. There are NO returns or exchanges on armor, firearms, ammunition, PPE equipment. Ammo ships UPS ground to the lower 48 states.
We reserve the right to fix any critical errors.

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7 Reviews

  • 4
    Fostech echo

    Posted by Lyle on 3rd Mar 2019

    This trigger is absolutely awesome! Only have 4 mags through it but haven’t had a single malfunction the echo mode is very smooth and you can really run this fast. The trigger pull leave a little to be desired that’s why I took a star off but I will totally buy another in the future

  • 5
    Binary Trigger

    Posted by Tim Guy on 1st Feb 2019

    I have bought at least 4 of these binary triggers from BOTACH. These are the best triggers and they have the lowest price around. I will be buying more.

  • 5
    Buy Ammo in BULK

    Posted by Beyond Seclusion on 25th Oct 2018

    I was really nervous about getting this. What if it didn't work, etc. It did and thus far, has worked great. I spoke at length with FosTech and they have been great. Follow the instructions and you should be fine.

  • 5
    Awesome deal on Echo II

    Posted by Eric Spear on 17th Oct 2018

    The Fostech Echo II Binary trigger is the best binary available, Lists for $479.00 on the Fostech website and can be found $20 cheaper on some third party sites but Botach has it one sale for $369.95 which is $109.05 discount! If I had a bit more spending money I'd have bought more before they sell out. This is truly a "drop-in" trigger for any milspec AR-15 and allows you to fire one round when the trigger is pulled and one round upon trigger release (in binary mode). ATF legal and way too fun.

  • 5
    Fostech Echo II Trigger

    Posted by MikeG on 17th Aug 2018

    Great price from Botach and very fast shipping. Was looking to get a binary trigger and really wanted to go the drop-in route and couldn’t be the price from Botach.

  • 5
    Already had one and it works great! Get one -- you won't be sorry. Got this second one due to GREAT price and for a second item awaiting "the install"

    Posted by Pat on 26th Jun 2018

    Excellent product at an excellent price PLUS no tax or shipping expense!

  • 5

    Posted by D1eek on 8th Jun 2018

    The bomb works great

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