This is an injection-plastic military vehicle model kit.
From the manufacturer:
The British Army purchased several Polish-built 40mm Bofors guns in 1937, designating them the Ordnance Quick Fire (OQF) 40mm MkI. Suitably impressed with this weapon, a production licence was acquired from Bofors and the gun was produced at Royal Ordnance factories in Britain. The gun was changed from metric to Imperial measurements, and several design improvements were made to facilitate mass production. This British built gun was designated the OQF 40mm MkIII, and became the standard light anti-aircraft gun of the British Army.
This kit includes photo-etched parts and decals.