Steyr 4K 7FA-KSPz armored personnel carrier. The basic chassis is topped with a turret mounting a 90mm French or NATO gun, and ammunition is carried instead of most passengers. Two passengers are retained as scouts so the vehicle can be used for reconnaissance. The top hatch is replaced by the turret, but all other hatches are retained, and two hatches are in the turret for the commander and gunner. This vehicle is used in small numbers by Switzerland and Greece.

4K 7FA KSPz armored personnel carrier can be modified to carry the Rasit ground surveillance radar and a computerized management system as well as extra radios and a datalink system to higher headquarters. The M-2HB turret is removed in this vehicle. The radar has a range of 30 km and may be operated by a cable at a range of 30 meters.

The 4K series has undergone a series of upgrades mainly involving the uprating of the engine and the external distinguishing factor between the various versions appear to be the following: 4K3FA - Two light clusters & protective cage, 230hp engine, glacis access hatch with 2 handles.4K4FA - Single light clusters, 250hp engine, larger glacis access hatch touching glacis edge.4K7FA - Single light clusters, chocks, 320hp engine, full-width side-hinged glacis access doors.G127 - Single light clusters, chocks, 325hp engine, full-width top-hinged glacis access doors.Leonidas - Single light clusters & protective bar, 320hp engine, full-width top-hinged glacis access doors.