In early 1930s the Polish Army was looking for a modern anti-tank and anti-air weapon. In 1931 the Poles acquired weapon systems from Hotchkiss, Solothurn and Oerlikon, and tested models of each, but all were considered unsuitable for Polish needs. The Poles instead developed their own design, a dual-purpose AA/ anti-tank weapon, with the first order for 100 being made August 1938. Production commenced that year, with the intention to provide each infantry division with 8 guns for AA defense, and it was used to up-gun the new TKS tankette armed with this 20mm weapon. Only 55 were produce in total before the September 1939 German invasion. This .stl pack consists of the tripod field mount and two of the actual gun, one with and one without a gunner.
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