Fostech Echo AK47 Binary Response Drop In Trigger

Fostech Echo Sport Trigger Fast Fire Binary Trigger System For AR-15 Platform Rifles, Safe, Semi, and Echo Firing Modes - Model 4140

Fostech Echo-II Drop In Trigger For AR-15 Platform Rifles - Gen II - Patented Fast Fire Trigger System by Fostech... ATF Approved

Fostech LITE Complete AR-15 Pistol Lower W / PDW Brace and Echo ARII Trigger Installed

Fostech Echo AR-II Drop In Trigger For AR-15

New Echo Sport Pull & Release Trigger System By FosTecH Inc.

FosTecH Fighter LITE Tomcat Pistol with Echo AR-II Trigger in Sniper Grey - 5.56 NATO, 30 Rd Mag, PDW Brace - Factory Blem