A6M3/A6M3a Model 22 - folding wingtips and regained its capabilities for long operating range, active in the Solomon Islands campaign. 560 were built. A6M3 (Model 22 Early - mean difference, 翼内 九九式一号20mm機銃2挺) / A6M3a (Model 22 Late - mean difference, 翼内 九九式二号20mm機銃2挺)
The Model 32, 22, 22 kou, 52, 52 kou and 52 otsu were powered by the Nakajima 栄 (Sakae) 21型 engine