Fostech Echo ARII Trigger for ARsThe Fostech Echo ARII Trigger for ARs is an advanced binary firing system designed to enhance the performance of AR platform rifles. This innovative trigger allows for one round to be fired on both the pull and release of the trigger, effectively doubling the rate of fire while maintaining control. The Echo ARII features a unique Auto Reset design that enhances safety and reliability. With three modes of operation Safe, Semi Auto, and Echo this