Fostech Echo AR-II Trigger takes innovation to the next level with its groundbreaking, ATF-approved drop-in design, now fortified by a striking new billet trigger case. This bold black case, meticulously laser-engraved with the FosTech logo, isn’t just for looks—it delivers enhanced precision and support, ensuring your trigger performs flawlessly in any scenario. And with its 3-position selectability, the Echo AR-II lets you effortlessly shift between Safe, Semi, and the exhilarating Echo Mode, giving you versatility and control. The Echo AR-II Trigger is more than a trigger—it’s a statement of precision, control, and pure FosTech ingenuity.  This is a new binary type echo trigger.  It fits most AR pattern rifles with an M-16 type bolt carrier.

Requirements: 

• Mil-spec AR15 Lower Reciever
• Ensure the lower does not have a sear block or other non-mil-spec attributes
• Must have matching buffer assembly (Both carbine and rifle length will work, but must not be mismatched.
• Ensure buffer is not solid, sand or captured spring.

Must have full-auto bolt M16 cut.