This is a hammer and safety swap for a Milspec trigger allowing the shooter to rapidly engage the trigger, this works in conjunction by the hammer hitting the trigger during cycling allowing it to reset the trigger, then once the trigger is reset the safety will rotate locking the trigger into safe mode. Only when the bolt carrier is back into battery does the safety then rotate allowing the trigger to be pulled thus repeating the cycle, this is a semi auto trigger as it fires one round per trigger pull and interacts with a semi auto disconnector before resetting. An h3 buffer, anti walk pins and rounded safety detent are the only things required outside of the included parts and are recommended for proper function of the system, h2 buffers will also suffice but you will need to make sure your system is tuned for this setup SILENT CAPTURE BUFFER SYSTEMS WILL NOT WORK. this is a pre order item with an estimated lead time of 1 month  10% restock fee