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Everything To Know About Binary Triggers
Everything To Know About Binary Triggers
25:36 | 3 years ago

Fostech Echo Sport Trigger Fast Fire Binary Trigger System For AR-15 Platform Rifles, Safe, Semi, and Echo Firing Modes - Model 4140

MPN: 4140  |  UPC: 639266300502

PRODUCT DESCRIPTION

The Echo Sport from Fostech is a more economical version of their world-famous Echo II rapid-fire trigger system for the AR-15. It has all the functionality of the Echo II trigger with the only difference being that you select the Echo mode from a paddle located in front of the trigger, rather than through the use of the safety selector. The advantage of the Echo Sport trigger is that it provides the same binary (fire on pull and release)  trigger function as the original Echo II trigger, at a more affordable price. It is more efficient, less complex, and most importantly, less money than the Echo II. So what exactly are the differences between the Echo Sport Trigger and the Echo II?  Well, there is one primary difference. While the Echo Sport provides the same Echo Firing mode as the original Fostech Echo II Trigger, the controls have been modified to eliminate the use of the 3rd safety selector position. Instead of utilizing the safety selector to go to the third Echo Mode position.... as select-fire rifles would do...., a control paddle in front of the trigger guard moves side to side to select single fire or Echo firing modes. Therefore, with the exception of the firing mode selection method, you get the same highly sought-after Echo functionality, but at a significantly lower price!
For more complete details regarding the Echo Sport trigger Please click on the SHOW MORE + Tab below. 

The Echo mode option provides a greatly reduced gap time between rounds resulting in tighter follow-up shot placement. It is also a ton of fun. The Echo Sport trigger is designed to work in direct impingement AR-15 platform firearms and works with any standard full-auto style bolt carrier group which are the BCGs that are utilized in virtually all current production ARs.  It provides a clean, crisp trigger pull regardless of the firing mode selected and the trigger pull in semi-auto mode is as good as, if not better, than most other standard mil-spec triggers. The Echo Sport trigger is fully approved by the ATF. 

Summary:

The Echo Sport Trigger allows the shooter to select from 3 different settings:

Safe Mode: Firearm will not fire. 
Semi-Automatic Mode: Firearm fires when the trigger is pulled. 
Echo Mode: Firearm fires when the trigger is pulled and also when the trigger is released. 

The Echo Sport is different from Fostech’s Echo AR-II in that there’s an added paddle switch in front of the trigger to change firing modes from binary to standard semi-automatic firing instead of using the safety selector like the original Echo trigger.

The Echo Sport trigger is designed with safety as the utmost priority. When the shooter is in the Echo Mode and depresses the trigger firing one round, the shooter can move the paddle to the semi position while firmly holding the trigger rearward and a second-round will not fire upon release. 

Patented ATF Approved design.
Not a single drop-in assembly like the original Echo II.
The Echo Sport functions with any full-auto style bolt carrier.

The Echo Sport trigger does not come with a bolt carrier. You will need a full auto bolt carrier in your firearm for the Echo Sport to function. Not sure if you have a semi or full auto bolt Click this link for further details.

This item cannot ship to California, the District of Columbia, Iowa, New Jersey, New York, Hawaii, Rhode Island, Florida, Maryland, Connecticut, Washington, Oregon, Massachusetts.

SPECS
Additional

The Echo Trigger has several distinct features:

  • Patented ATF Approved new design 
  • Light, clean, and crisp pull in Semi-Automatic Mode
  • Trigger Shape - Traditional Curved
  • Trigger Pull Weight - Range 5-8 lb
  • New paddle control design, eliminates use of 3rd selector position
  • Reliable function in Echo Mode
SKU ACC-FOSTECH-ECHO-SPORT
Country of Manufacture United States
License Requirement None
Manufacturer Fostech
Mfg. Part Number 4140
UPC 639266300502
Caliber/Gauge No
Action No
Barrel Length No
Barrel Twist No
Barrel Bore Type No
Barrel Finish No
Barrel Fluting No
Barrel Profile No
Mount Type No
Beam Color No
Firearm Fit AR-15
Threaded Barrel No
Condition New
Free Shipping No

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