The Type 92Jyū-Sōkōsha (九二式重装甲車 Kyū-ni-shiki Jyū-sōkōsha) was the first indigenous Japanese tankette. In the 1920's, Japan had imported and tested various European tankettes, such as the Type Ka MG Vehicle. It was decided that a small mobile vehicle based loosely on the Carden-Loyd Mk.VI should be designed. Following the failure of the clumsy Sumida AMP, the Type 92 Jyū-Sōkōsha was conceived. It was designed for cavalry use, and as such was designated as a heavy armoured car, rather than a tankette. This was the result of sectionalism within the IJA: Tanks were used by infantry, and cavalry could not operate them. Though initially troublesome, the tank proved to be fairly effective overall, demonstrating its usefulness in the Second Sino-Japanese War. Production was plagued with issues, and in the end, only 167 vehicles were produced. While the vehicle saw progressional changes to armament, there were no official production variants. Changes to the vehicle included replacing the hull gun with a 13mmType 92 heavy machine cannon. Another modification added an external machine gun mount for mounting an additional Type 91 6.5mm. Later improvements included a new drive train, new suspension, and replacing the turret machine gun with a Type 96 chambered in 7.7mm. A custom 37mm was also tested in the vehicle. Some Type 92 Heavy Armoured Cars are said to have been fitted with the 20mm Type 98, though there is no known documentation to support this.