The Sturm-Infanteriegeschutz 33 was a heavy infantry gun carrier designed and produced by Alkett. From December of 1941 to October 1942, 24 s.I.G.33 auf Fgst. Pz.Kpfw.III (Sfl.) were completed. Its design was based on the Stug III Ausf B's chassis, although the production series ended up being retrofitted to the Stug III Ausf. E and F chassis. The vehicle was armed with a powerful 150mm L/11.4 heavy infantry gun but space limitations within the vehicle could accomodate only 30 150mm rounds and an additional 600 rounds for the MG34 close support machine gun. Stug 33s were operated by a crew of 5 and were employed exclusively on the Eastern Front. Twelve of the 24 StuG 33s produced saw action at the Battle for Stalingrad and used by the Sturmgeschutz Abteilung 177 and 244, but all were all lost in combat. The remaining 12 vehicles were used by Sturm-Infanteriegeschutz-Batterie Lehr Battalion XVII (training battalion) and later with the 23. Panzer Division. Sold Out!