Guns九九式二号機銃九九式二号機銃九九式二号機銃Caliber20 mmService193119321933193419351936193719381939194019411942194319441945Japan · Pacific≈ Sep 1943 – Aug 1945Aircraft 5193119321933193419351936193719381939194019411942194319441945A6M5 Model 52≈ Sep 1943 – Aug 1945A6M5b Model 52 Otsu≈ Apr 1944 – Aug 1945A6M5c Model 52 Hei≈ Oct 1944 – Aug 1945A6M7 Model 62≈ May 1945 – Aug 1945A6M5a Model 52 Kō