I know I'm late to the game But. Start here and get a bolt carrier and other parts as described in th Parts is Parts thread.
https://www.cdnnsports.com/remington-r15-556-16in-build-kit-mossy-oak-brush.html?trk_msg=IUNQI0C14QNK3EAI1G3UGKOKRK&trk_contact=PRONIAHTI69QGH9TL8A6LEIFBO&trk_sid=F967NCMHLT9MPNNFQ2QCU0H8H4&utm_source=listrak&utm_medium=email&utm_term=https%3a%2f%2fwww.cdnnsports.com%2fremington-r15-556-16in-build-kit-mossy-oak-brush.html%23.XyLOLi2z3UI&utm_campaign=CDNN+Sale+7-30#.XyLOLi2z3UI
