Has bolt and carrier group. Only missing rear sight(Flattop). I will get a rear sight for it, but I will probably use a red dot i have for the time being. The rest I already have; and the M16 was the rifle I used for my short term in the Marines, so I am familiar with its operation and maintenence. It just seems like a cheap price for what would essentially be a complete DPMS rifle that is BRAND NEW!