In March of 1942, Ausf F entered production. It was not only an assault gun but also a badly needed tank destroyer. Early models were mounted with long 75mm StuK 40 L/43 and late models with longer L/48 gun. It was produced until September 1942 with 359(360) produced. Ausf F was then replaced by Ausf F/8 armed exclusively with L/48 gun. It was produced until December of 1942 with 334 produced. Ausf F/8 paved the way for final Sturmgeschutz III model - Ausf G. Stug III Ausf F, F/8 and G's were also called Stug III (40), because they were all armed with 75mm StuK 40 guns. Stug III Ausf F and Ausf F/8 were produced by Alkett and their official designation was Gepanzerter Selbstfahrlafette fur Sturmgeschutz 7.5cm Sturmkanone 40 Ausf F-F/8 / Sd.Kfz.142/1