Awesome trigger system! - OpticsPlanet Exclusive Franklin Armory BFSIII AR-C1 Trigger - Binary Firing System for AR Platforms

I've had one of these for 2 years now, and it is the best firearm purchase I've ever made. The main reason I got this over an Echo system is that this is compatible with virtually any upper. I've used mine with a 9mm upper, .22LR upper and a 7.62x39 upper. While ideally used for a 2-4 shot burst, once you get your trigger cadence down it is capable of extremely fast fire. I can empty a 50 round drum in just a few seconds. In semi-auto mode it also has a nice, crisp action to it. Not like you will find with a specialty competition trigger, but much nicer than a basic trigger. If you want to go fast, this is the system for you!