FineScale Modeler reviews the 1/35 scale plastic model gun kit. Developed by Rheinmetall before WWII, the massive gun could propel a 1,268-pound concrete-piercing shell 22,800 yards once every four minutes. Fewer than 10 were produced; they were used during the Battle of France, Operation Barbarossa, Sevastopol, Leningrad, and the Warsaw Uprising.