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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.