Fostech Echo Trigger For AR-15 Platform Rifles - Gen II - Patented
FOSTECH ECHO TRIGGER FOR THE AK-47 RIFLE | Range USA
Fostech Echo Ar-Ii Drop IN Trigger FOR Ar-15
Help needed. Compatibility of echo trigger with Zastava m70 zpap? I can't find the answer anywhere. I've built many ARs but this is my first AK and am still learning the mechanics.