A trigger in binary manner employs two independent sears. Following the trigger is pulled and also a shot is fired, the hammer recocks and the disconnector arrests the hammer to stop automated fire (similar to it does in semi-auto method). The BFSIII B&T-C1 is explicitly made for the B&T APC9 https://edwardn742eed0.blogdosaga.com/32867778/binary-trigger-no-further-a-mystery