"Full Rotation" servos have ben modified to no longer be servos. They act like a geared motor with a built-in speed controller. At angles near 90 they stop. At angles below 90 they rotate in one direction. At angles above 90 they rotate in the other direction. They are most often used for the wheels of little robots.
I'm afraid you will need to buy regular servos if you want to hit and retract.