My metaltech 3 was really accurate and had a 5/16 double flopper shaft with 2 5/8 rubbers. I would shoot fish so far away you could hear the shaft ripping through the flesh after you shot. It had front wings on it in order to float which made it even more accurate but hard to handle. The weight of it also reduced recoil.
The front plastic foam wings make metaltech #3 an up float. #2 needs full length wings to float.