Geissele Automatics Super Duty MOD1, Complete Upper Receiver, 556NATO, 10.3" Cold Hammer Forged Barrel, 1:7 Twist, HuxWrx Flash Hider-QD Muzzle Device, M-LOK Free Float Handguard, Geissele Airborn Charging Handle, Nanowepon Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black 08-543B