Fostech Echo Trigger For AR-15 Platform Rifles - Gen II

The Echo AR-II Trigger is a groundbreaking drop-in design that is approved by the ATF. The Echo AR-II trigger does not come with a bolt carrier. You will need a full auto bolt carrier in your firearm for the Echo AR-II to function. The Echo AR-II is designed to function in the AR-15 Platform.

The Echo Trigger allows the shooter to select from 3 different settings:

1. Safe Mode: Firearm will not fire.
2. Semi-Automatic Mode: The firearm fires when the trigger is pulled.
3. Echo Mode: The firearm fires when the trigger is pulled and also when the trigger is released.

Requirements: 

• Mil-spec AR15 Lower Reciever
• Ensure the lower does not have a sear block or other non-mil-spec attributes
• Must have matching buffer assembly (Both carbine and rifle length will work, but must not be mismatched.
• Ensure buffer is not solid, sand, or captured spring.
• Must have full-auto bolt M16 cut.

PATENTED Design that gained ATF Approval (Patent # US 8,820,211 B1)