Way better than thr echo sport- - Fostech Echo AR-II Drop-In Binary AR-15 Trigger

If you think you’re ready for a binary trigger and you want to attempt controlling rapid fire, go ahead and save an extra hundred dollars for the echo two as it is much easier to install and the trigger pole and reset or a lot more like what you would expect from an AR trigger. I bought an echo sport as well. And it was bugger to install once I got it in the trigger pole felt like a cheap 22 trigger from a gun I bought at Walmart. The reset is difficult to catch and the binary was difficult to control. The echo two appears much improved in these aspects, it took me 15 minutes to install. The tricky part was getting the upper to close at the end of the install, but there are instructions for that.