1st one defective, 2nd one works o.k. - Fostech Echo Sport AR-15 Binary Trigger

The first one I got would not lock the selector switch in position and Fostech's support was rather pathetic - I don't have the feeling that there is a lot of QA going on or that they stand behind their products. After several calls with OP, I got a replacement. Installed it and it works as designed. Yes, pretty fast rate of fire, but a bumpfire stock is wayyy faster. This trigger is a rather useless gimmick and I would not invest in it again - maybe I would try a different binary trigger, but I doubt that I would buy Fostech again.