The Pzkpfw IV mit 7,5 cm Ruckstossfrei Kanone 43 & 3cm MK 103, known ingame as the Pzkpfw IV H with RfK43, was a experimental version of the Panzer IV Ausf H.
The turret was heavily modified, the 7.5 cm KwK 40 L/48 was replaced with a 3 cm Rheinmetall-Borsig MK 103. On both sides of the turret, recoilless 7,5 cm Ruckstossfrei Kanone 43 were installed. These can fire 7,5 cm HEAT rockets a long distance. One shot is enough to badly damage a IS-2 tank. There are two different types, the standard HEAT and a experimental HEAT-FS rocket dealing more damage and travelling at a flatter trajectory. The MK103 gun, also modified to make the Jaboschreck AA-gun, can fire 400 rounds/min with an armour penetration with APCR at about 42-52 mm (1.65-2 in)/60°/300 m (656 ft) or 75-95 mm (3-3.7 in)/90°/300 m (656 ft). It can easily destroy a heavy tank with this gun. Only a wooden model was built during the war.