The Nkm wz.38 FK (Polish military acronym meaning Heaviest Machine Gun Mark 1938) was a 20mm heavy machine gun (autocannon by modern terminology) produced in inter-war Poland. It was used both in anti-air and anti-tank role it was also adapted to tank use and mounted on some TKS tankettes. Mass-produced in 1938 and 1939 it was used extensively during the September Campaign.
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