Fostech ECHO Spring Mod to Improve Trigger Pull Weight: Video Review and Field Test

Fostech ECHO

Binary trigger

AR-15 Binary trigger

rapid fire trigger

Echo improvement

DIY trigger improvement

mbell556

Michael Bell

Fostech Echo mod

Fostech Echo modification

AR-15.com

AR-15 trigger

5.56

improved trigger pull

back up disconnector

Echo modification

Echo mod

DIY echo mod

DIY echo modification

Franklin Armory BFS

Gen 2 Echo

Fostech Echo Generation 2