Its alright. - Fostech Echo AR-II Drop-In Binary AR-15 Trigger

It's an alright item and does what it's supposed to...for the most part. I purchased 2 of these and after a few mags they started acting up. Twice now, my rifle stopped firing until I moved it through the settings a few times and ran the bolt manually. The trigger pull on the echo mode isn't that great and takes a it of getting used too, marking accuracy suffer as a result. I feel like they are close on this one, but not quite where it needs to be. Also the metal the kit is made of feels kind of soft and the hammer has deformed a little just from striking the firing pin.