I have a fostech. The echo mode has a funky trigger, where you must pull all the way to the back, before the secondary disconnect disengages. There are modifications on YouTube to address the trigger pull length, which works well. I am hoping fostech is working on a fix, because the trigger can be better designed.

The first time I tried it, I was able to do controlled bursts very easily and semi accurately. It is controlled during simulated full auto mag dumps. This would be awesome on a shrike or other belt fed ar uppers.

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