Worst product on optics planet - Fostech Echo Sport AR-15 Binary Trigger

This thing is a piece of c*** and you cannot install it.I just spent the last hour and a 1/2 trying to install a piece that literally just rested there until you put the safety selector through.Oh and that I mentioned that it needs Spring tension on it as well question. Mark also the instructions are garbage. They're incredibly vague. The pictures they take are of the side of the receiver. Not showing anything that you're doing on the inside of the receiver so basically. It's like Hey guess where this goes guess where that goes and when you watch the instructional video on the site from the experts from this stupid company. The experts don't even show you how to do things if you watch the video you have to zoom in to A480 picture which is. Incredibly hard to see incredibly grainy. Would not recommend. Cannot install. Left an angry message with the company to. Ask them how to do it. And this is a piece of garbage. Do not buy this do not buy this do not buy this.