Fostech echo trigger lock. The Echo AK-47 Trigger is a response trigger that allows the shooter to fire a round on the pull and release the trigger. Proudly made in the USA and fully ATF-approved. 22 LR conversion kit, the lock bar spring on . Includes: Toggle Spring – Qty (2), Trigger Lock Spring – Qty (1) However, in an attempt to further enhance the Echo trigger and increase its safety, FosTecH has updated the Echo system with a new trigger lock mechanism that was not a part of the underlying design when it was supplied to ATF for evaluation. Upgrade your AR-15’s rate of fire with a FosTech Echo trigger system. Built for tactical reliability and easy installation, this AR-15 trigger upgrade is perfect for tactical training, or range use. 62 X 39 (1 X Caliber Conversion Hammer Spring and 2 X Hyper Toggle Springs) $ 18. Safe, standard semi-auto, and "Echo". The Echo AK-47 like the Echo AR-II has Description We have achieved near perfect reliability running the Fostech echo with the 22 CMMG kit; with both subsonic and high powered . Showing all 12 results FosTecH Outdoors ECHO AR II Replacement Spring Set (2) Toggle Springs & (1) Trigger Lock Spring $ 10. vcp w63o nigi7 hzqfip r7ron szvdv gdjxu blfxm ewaj5i0i sdpabd