This is a complete .300 Blackout Upper Assembly with a 10" Quad Rail and 10.5" .300 Blackout Barrel
The parts included are below:
10.5" Phosphate Blackout Barrel
Thread size: 5/8 x 24
10" Keymod Rail Hand Guard
Gas Tube, and low pro gas block
Ejection Port Cover
Charging Handle
Forward Assist
Flash Suppressor with Crush Washer
M-16 Bolt Carrier Group