A stent graft delivery system including a tip assembly, a middle member tube, a sheath assembly, and a unitary front grip. The sheath tube is axially slideable within the distal front grip lumen, the threaded assembly distal end is disposed in the proximal front grip lumen and fixed to the unitary front grip, and the first threaded tube portion and the second threaded tube portion are radially compressed together by the unitary front grip. The sheath handle engages the exterior thread of the threaded assembly in a first configuration to move the sheath tube axially relative to the middle member tube and tip tube through rotation of the sheath handle and disengages the exterior thread of the threaded assembly in a second configuration to move the sheath tube axially relative to the middle member tube and tip tube through axial motion of the sheath handle.
