 The first two prototypes had twin 7.5 mm Reibel machine guns placed on top of the roof as an AA-weapon, a third was coaxial.In the first design proposal for a 120 mm version, the conventional turret had a high cupola armed with both a machine gun and a 20 mm MG 151 rapid fire cannon.However the third and fourth "120 mm" oscillating turret prototypes had a single 7.5 mm AA machine gun and a second 7.5 mm coaxial machine gun.