Type 99-1
The Type 99-1 was adopted by the Japanese for both fixed and flexible installations. The fixed installation was developed first, as a fighter gun fed by a 60-round drum magazine, mounted in the wings of the famous Mitsubishi A6M Zeke or Zero. A flexible version, initially developed for the Mitsubishi G3M bomber, was inverted to put the ammunition drum below the line of sight of the gunner. Smaller drums (45, 30 or 15 rounds) were used on flexible installations where space was limited.
The limited ammunition capacity was an important disadvantage. The Type 99-1 Fixed Model 3 could be equipped with a 100-round drum, but the size of the drum was itself a problem in fighter installations, although the Model 3 guns were installed on the initial production versions of the A6M3. A more practical solution was provided by the Type 99-1 Fixed Model 4, which featured a Kawamura-developed belt feed mechanism.
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