Second generation of the of the ergonomic joystick; This had a bigger handle, and bigger fire button on the top, as well as a trigger button on the front of the handle.. The fire button on the base was removed, but auto-fire switch mode was added.
QuickShot II Plus arrived in 1984, not much seems to have changed apart from new switches.
QuickShot II Turbo came on the marked in 1985; The base was changed a little bit in design, an changed color from black to red plastic (with black "grip wings"); the Auto-fire switch got a third setting, allowing it to be used with Amstrad CPC.
The Turbo was also sold under the Sigma label