This is an injection-plastic military vehicle model kit.
From the manufacturer:
The Type 60 Self-Propelled 106mm Recoilless Gun is a light anti-tank vehicle, deployed by the JGSDF from 1960 to 2008. The Model C was powered by a water-cooled diesel engine. Molded in dark green, tan and clear plastic, with decals and thread included.
Note: The manual included with early versions of this kit has incorrect instructions in three of the steps. Please see the image above featuring Step 17, Step 22, and Step 28 for the correct version of the instructions.