Metal upper rail , metal outter barrel adapting ring.
It already comes with charging handle, bolt cover..etc, so you don't have to buy them seperately!
Very good price as a replacement piece.
It comes with everything already (charging handle, bolt cover..).
Lighter weight compare to a metal upper reciever.
Very solid built & good for CQC because of its weight.
Rating: [5 of 5 Stars!]