Shop › GE SUPER DUTY MOD1 5.56 16 URG BLK GE SUPER DUTY MOD1 5.56 16 URG BLK $1,285.20 Geissele Automatics Super Duty MOD1, Complete Upper Receiver, 556NATO, 16" Barrel, 1:7 Twist, HUXWRX Flash Hider-QD 556, 15" SMR MK16 M-LOK Free Float Handguard, Geissele Airborne Charging Handle, Nanoweapon Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black 08-548B Quantity: Add To Cart Added! Geissele Automatics Super Duty MOD1, Complete Upper Receiver, 556NATO, 16" Barrel, 1:7 Twist, HUXWRX Flash Hider-QD 556, 15" SMR MK16 M-LOK Free Float Handguard, Geissele Airborne Charging Handle, Nanoweapon Reliability Enhanced Bolt Carrier Group, Fits AR-15, Anodized Finish, Black 08-548B