Interesting trigger. There has been a bunch of activity recently regarding these type of triggers where you get one discharge when the trigger is pulled and another when the trigger is released. Fos Tech, Franklin Armory and TacCon are the three "big" names doing these. They all offer selectors that have safe, std fire, and the binary setting where they fire on pull and release. I have been surprised that ATF hasnt ruled against these but as of right now they are legal. The Fos Tech and Franklin Armory trigger have been the most reliable so far but its not like there is that much time with any of them.
It would be really interesting to put one of these into a rifle with a belt fed upper. Probably as close as you can get to a legal SAW (not sure if these will go into the new semi auto SAWs).
To me they are kind of novelty items. Fun as hell for the first few super fast mag dumps then the price of the ammo for those mag dumps sets in
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Chris