The M3A3 benefited from the improvement in hull design which was introduced with the M5 light tank. Its main feature was a 20° sloped and thickened welded hull, which greatly improved their survivability. It was just slightly heavier, but easier to produce than the original one. They also had a turret rear overhang to house a radio. The M3A3 hull was also roomier, and this space was used to add more fuel and ammunition storage. Regular storage amounted to 174 rounds for the M6 gun with M44 mount and 7500 rounds for the three M1919A4 machine guns. The turret originally had a basket, but crew practice was to remove to free space. 3427 were produced, the last one leaving the factory in October 1943, and in British service it was called Stuart Mk. V. Through the year 1943, all regular units operated only as scouts and were gradually replaced by improved M5 tanks.
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