Fostech Echo AR-II Drop-In Binary Trigger Metallic FT-ECHO-ARII

Fostech Echo AR-II Drop-In Binary Trigger Metallic FT-ECHO-ARII. These Rifle Triggers feature an innovative drop-in design for easy installation and deliver crisp light pulls while in semi-auto mode. Overall the Fostech Echo Trigger has 3 different modes: safe (firearm will not fire) semi-auto (gun fires when trigger is pulled) and echo (weapon fires when trigger is pulled and released). These drop-in AR 15 triggers require a full-auto bolt carrier to function properly and bolt carriers are not