ECHO SPORT TRIGGER The Echo Sport is an economical pull and release trigger for the AR-15 Platform. The Echo Sport has the functionality of the Echo AR-II, the only difference is that you select the echo mode from a paddle rather than the safety sector. The Echo Sport is designed to function in the AR-15 Platform. The Echo Sport gives you all the functionality of the original AR-II at a more affordable price. It is more efficient, less complex, and most importantly, less money. Full Auto Bolt Carrier Options from Fostech: Fostech Complete Bolt Carrier Group (Nickel Boron) Fostech Complete Bolt Carrier Group (Black Nitride Coating) Fostech Complete Low Mass Bolt Carrier Group (Nickel Boron) In-Stock – Ships 2-4 business days after ordering. The Echo Trigger allows the shooter to select from 3 different settings: Safe Mode: Firearm will not fire. Semi-Automatic Mode: Firearm fires when the trigger is pulled. Echo Mode: Firearm fires when the trigger is pulled and also when the trigger is released. The Echo Sport trigger does not come with a bolt carrier. You will need a full auto bolt carrier in your firearm for the Echo Sport to function. Full Auto Bolt Carrier Options from Fostech Fostech Complete Bolt Carrier Group (Nickel Boron) Fostech Complete Bolt Carrier Group (Black Nitride Coating) Fostech Complete Low Mass Bolt Carrier Group (Nickel Boron) Buy Link: https://rarebreedfrttrigger.com/product/echo-sport-trigger/