The M2A4 Light Tank was the main production version of the series.8 Was developed at the Rock Island Arsenal.8
Standardized in 1939.1 37 mm gun mounted in the single turret.1,8 Hand traverse. Fired an 1.9 lb AP shell at a velocity of 2,900'/sec.7 The .30 cal MG filed a shell at 2,800'/sec.7 Few late production vehicles had Guiberson T1020 diesel.
Was delivered in April 1940 by the American Car and Foundry Company.5
The M2A4 saw some action in the early Pacific battles in the Philippines.1 Also saw combat on Guadalcanal.5 They were plagued by ammunition shortages and shortages of spare parts. Were in service in some areas of the Pacific until 1943.