If I puchase a registered auto sear and place it in my AR15, with the required M16 parts would it be legal? I thought it would be illegal to put M16 parts in a civ AR15. but as we all know adding a autosear will not make the rifle full auto. you have to add the M16 parts for it to function, and that would be illegal considering the receiver is not a NFA receiver, right? any advice would be appreciated thanks, Joe