Pricey and expensive...worth every dime. - Fostech Echo AR-II Drop-In Binary AR-15 Trigger

This trigger is not for beginners. Several people posted complaints about compatability issues, price, etc. If you don't do your homework, don't complain. If this trigger costs more than your Del-ton, don't buy it, plain and simple. On to the good stuff... Best. Trigger. Ever. 200 rounds through it on the first day, not ONE issue. Daniel Defense receiver, Adams Arms Piston kit, J P Industries spring capture, 18" 223 Wylde with Venom brake. You have to learn the tricks to install it, and a simple trick to close the receivers. DEFINITELY worth the learning curve. On semi, the trigger breaks around 4.5 lb and is a crisp smooth single-stage trigger. On Echo mode, a double-tap is more natural than a single semi shot! Seriously, you won't believe it's the same gun. Accurate rapid-fire shots are very possible with a 'lil practice. The difference between a bump-stock and this, are like Fred Flintstone and Mario Andretti. It is a precision upgrade for serious shooters.