Question specific to the M16 trigger with the open rear for the rear tab on the disconnector. Is this part in and of itself when used with the correct semi disconnector, semi selector, and semi hammer, legally usable in a semi auto AR. In the same manner that a M16 bolt carrier is legal. I am speaking to the use of the trigger (and only the trigger) and all other accompanying items in the trigger assembly being the semi auto parts. Is that cut out in the rear a feature that kills it for legal semi auto use.