Geissele Automatics Super Duty MOD1, Complete Upper Receiver, 5.56 NATO, 12.5" Cold Hammer Forged Barrel, 1:7 Twist, HuxWrx Flash Hider-QD Muzzle Device, M-LOK Free Float Handguard, Geissele Airborne Charging Handle, Nanoweapon Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Desert Dirt Color 08-545S