ZB vz. 26
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The ZB vz. 26 was a Czechoslovak light machine gun developed in the 1920s, which went on to enter service with several countries. It saw its major use during World War II, and spawned the related ZB vz. 27, vz. 30, and vz. 33. Wikipedia
Action: Gas-operated, tilting breechblock
Barrel length: 672 mm (26.5 in)
Designed: 1924
Effective firing range: 1,000 m (1,100 yd)
Feed system: 20- or 30-round detachable box magazine
In service: 1926–present
Manufacturer: Zbrojovka Brno, Zastava Arms