This is a complete upper assembly in .300 blackout. Brand new.
Includes bolt carrier group and charging handle.
This complete upper features:

16" length Barrel.
4150 Chromemoly vanadium barrel with magnesium phosphate finish.
Carbine Length Gas System.
.300 AAC Blackout Chamber
1 in 8" twist rate
M4 Feed ramps.
Picatinny Railed Front Gas Block .750 diameter under gas block.
A2 Flash Hider 5/8 - 24 Thread.
Carbine Hand Guards w/ heat shields .
Forged upper receiver.

I am willing to ship if buyer covers the cost.