Kammala jumla mai zuwa: An fara aikin don haɓaka bindigar tanki na 105mm (4.1 a) a cikin WWII don yin gasa tare da ƙara yawan tankunan Jamus masu ɗauke da makamai. Bayan mamayewar Turai, Ma'aikatar Ordnance ta yi imanin cewa za a buƙaci tankuna masu ɗauke da makamai masu ƙarfi don kutsawa cikin yankuna masu ƙarfi. Sun ba da shawarar cewa samfurori na tankuna masu nauyi na M6 da ke gudana su kasance masu ɗamara da kuma shigar da sabon 105mm T5E1. Wadannan T1E1s da aka gyara tare da bindigar T5E1 a cikin manyan turrets (wanda aka dauka daga aikin T29 da aka gabatar) an sanya M6A2E1. Shirin M6A2E1 bai ci gaba ba lokacin da Eisenhower ya ƙi amfani da shi a
Turai a ranar 18 ga Agusta, 1944, amma an yi amfani da M6A2E1s guda biyu <unk> ba tare da karuwar makamai ba <unk> don gwada makamai da bindiga don T29 Tank Tank mai zuwa.