This FosTech Echo AR II trigger assembly is a drop-in binary trigger system designed for the AR-15 platform, offering three distinct modes of operation including safe, semi-automatic, and echo mode. In echo mode, the unit is designed to discharge one round upon the pull of the trigger and a second round upon its release, provided the safety selector is not moved to a different position between actions. The assembly features a matte bronze-tone finish on the trigger housing and blade. Key markings on the packaging and unit include the manufacturer branding FosTech, the model designation ECHO AR II, and the red numerical mark 4150. Transcribed patent numbers include U.S. Patents 8,820,211, 8,667,881, and 9,952,012. The kit is presented in its original retail blister packaging and includes a secondary sealed plastic bag containing a proprietary safety selector, pins, and necessary installation components. The manufacturer's contact information and the UPC 639266300021 are clearly visible on the reverse of the card.

The trigger assembly is in new, unused condition, remaining sealed within its original manufacturer blister packaging. The matte bronze-tone finish appears consistent and free of wear or handling marks. Internal springs and components are visible through the clear plastic and appear correctly seated. The secondary component bag remains factory sealed. The retail card shows minimal shelf wear and remains intact. We have not function-tested this component.