Fostech Echo Arii Trigger For The Ar-15 Platform
$399.99
The Fostech Echo Arii trigger for AR-15 platforms is a patented, ATF-approved trigger system that gives you three distinct firing modes in one unit. If you shoot semi-auto competitions, train for defensive scenarios, or just want to explore what modern trigger technology can do, the Echo Arii delivers flexibility without sacrificing safety. It's built around licensed technology from Franklin Armory and Hiperfire—names that matter in the trigger world—and combines reliability with a clean, crisp pull in semi-auto mode.
What sets the Echo Arii apart is Echo Mode, the signature feature. When enabled, the trigger fires on both the press and the release of the trigger—effectively doubling your rate of fire. That sounds wild, but the safety architecture is designed so you stay in control. If you're in Echo Mode, depress the trigger, fire one round, and then move the selector to Safe before releasing, the second round simply won't fire. It's engineered so the shooter calls the shots, not the gun.
The three-position selector gives you Safe (firearm won't fire), Semi-Automatic (single round per trigger press), and Echo Mode (rounds on both press and release). The semi-auto pull is noted for its light, clean feel, and Echo Mode function is proven reliable under real use. This is a precision-machined drop-in for the AR-15 platform that brings patented engineering to your rifle.
Key Features
- Three selectable firing modes: Safe, Semi-Automatic, and Echo
- Patented design with ATF approval (U.S. Patent #8820211 B1)
- Licensed technology from Franklin Armory and Hiperfire (U.S. Patents #9952012, #9952013)
- Light, clean trigger break in semi-automatic mode
- Safety-priority design—Echo Mode won't fire on release if selector moved to Safe before trigger is released
- Reliable function across all modes
- AR-15 platform compatible
Specifications
| Platform | AR-15 |
| Firing Modes | Safe, Semi-Automatic, Echo |
| Patent Status | Patented design (U.S. #8820211 B1); licensed technology (U.S. #9952012, #9952013) |
| Regulatory | ATF Approved |
Frequently Asked Questions
Is the Echo Arii trigger legal?
Yes. The Echo Arii carries ATF approval and is patented U.S. technology. It is legal for civilian use as a semi-automatic trigger with selectable firing modes.
Will the Echo Arii fit my AR-15?
The Echo Arii is designed as a drop-in trigger for the AR-15 platform and is compatible with standard AR-15 receiver fire control groups.
What happens if I'm in Echo Mode and move the selector to Safe before releasing the trigger?
The trigger will fire one round on the press, and moving the selector to Safe before you release the trigger prevents the second round from firing on release. This design keeps you in control of the rate of fire at all times.
Can I use the Echo Arii in semi-automatic mode like a normal trigger?
Yes. In Semi-Automatic Mode, the trigger fires one round per trigger press, just like a standard trigger. It delivers a light, clean break in this mode.
