Mil-Spec forged upper Receiver, Anderson 16 ” Med Contour Barrel with 1:7 Twist 300 Blackout Caliber, Parkerized Finish,  Carbine Gas System, Chrome Lined MPI Tested M16 Bolt Carrier Group, Charging Handle, 12 in Free Float Keymod Handguard, A2 Style Flashhider, Mil-Spec LPK, Mil Speck 6 position Stock and buffer kit (milspec diameter tube). This is everything to build a complete rifle minus the stripped lower receiver.