Sd.Kfz.142 Sturmgeschütz III

Quoting from Wikipedia:
 * "The Sturmgeschütz III (StuG III) assault gun was Germany's most-produced fully tracked armoured fighting vehicle during World War II, and second-most produced German armored combat vehicle of any type after the Sd.Kfz. 251 half-track. It was built on the chassis of the proven Panzer III tank, replacing the turret with an armored, fixed superstructure mounting a more powerful gun. Initially intended as a mobile assault gun for direct-fire support for infantry, the StuG III was continually modified, and much like the later Jagdpanzer, was employed as a tank destroyer."

This model of the StuG III was modeled by Aemi1970. It includes a moving gun and hatches.