The FosTech Echo AR-II trigger for the AR-15 platform gives you three selectable settings, Safe, Semi-Automatic and Echo (brand part no. 4150). It comes from FosTech Outdoors and is built on a patented design with technology licensed through Franklin Armory and HIPERFIRE, aimed at a light, clean, crisp pull in Semi-Automatic mode. In Echo Mode the firearm fires when the trigger is pulled and again when the trigger is released. FosTech made safety a priority, so moving the selector to Safe stops the second round from firing on release. It is proudly made in the USA and meant for AR-15 owners who want a different kind of range trigger.

Key Specifications

• The selector has Safe, Semi-Automatic and Echo settings.
• Safe mode means the firearm will not fire.
• Semi-Automatic mode means the firearm fires when the trigger is pulled, with a light, clean, crisp pull.
• Echo Mode means the firearm fires when the trigger is pulled and also when it is released.
• The design is patented, with technology licensed through Franklin Armory and HIPERFIRE.
• It is built for the AR-15 platform and is compatible with standard AR-15 lowers.
• It is made in the USA by FosTech.

Frequently Asked Questions

What happens if I move the selector to Safe in Echo Mode? After the first round fires, moving the selector to Safe means a second round will not fire on release.

What do I need besides the trigger? FosTech says a full-auto bolt carrier is required for the trigger to function, along with a mil-spec AR-15 lower without a sear block and a matching, non-solid buffer.

What does Semi-Automatic mode do? The firearm fires once each time the trigger is pulled, as it would with a standard AR-15 trigger.

Buy the FosTech Echo AR-II Trigger for AR-15

Three settings, one selector, and a trigger made for the AR-15 platform. Order it through our AR triggers lineup from our Lubbock, Texas gun shop and it ships fast and insured.