Geissele Automatics Super Duty Mod 1 Upper Receiver Group 11.5″ 5.56, Desert Dirt Color Geissele Part Number 08-544S
Geissele Automatics Super Duty Mod 1 Upper Receiver Group 11.5″ 5.56, Black Geissele Part Number 08-544B
Geissele Automatics Super Duty Mod 1 Upper Receiver Group 16″ 5.56, Desert Dirt Color Geissele Part Number 08-548S
Geissele Automatics Super Duty Mod 1 Upper Receiver Group 16″ 5.56, Black Geissele Part Number 08-548B
Geissele Automatics Super Duty Mod 1 Upper Receiver Group 14.5″ Pinned 5.56, Desert Dirt Color Geissele Part Number 08-547S
Geissele Automatics Super Duty Mod 1 Upper Receiver Group 14.5″ Pinned 5.56, Black Geissele Part Number 08-547B
Geissele Automatics Super Duty 16″ 5.56 HBAR Heavy Barreled Upper Receiver, Desert Dirt Color Geissele Part Number 08-660S
Geissele Automatics Super Duty 16″ 5.56 HBAR Heavy Barreled Upper Receiver, Black Geissele Part Number 08-660B
