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

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

Fostech Tech-15 9mm S/A - Binary AR Platform Pistol 7.5" Faxon Bbl, 7" Mach 2 Rail, 33rd, Echo AR-II Trigger, W / Brace, 8157-BLK-9MM-6230-4150-007-PB

Fostech Echo AK47 Binary Response Drop In Trigger

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

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

Brigade MFG BM-9 Echo Pistol - FOSTECH EDITION w/ Fostech Echo Trigger Installed, SBA3 Tactical Brace, W/ One High-Capacity Glock Compatible Magazine

EchoMaster MRC-HDDVR Install Video