Nkm wz. 38 FK
| nkm wz. 38 FK | |
|---|---|
The gun in light infantry configuration | |
| Type | Anti-air and anti-tank heavy machine gun/autocannon |
| Place of origin | Poland |
| Service history | |
| In service | 1938–1939 |
| Used by | Poland |
| Wars | World War II |
| Production history | |
| Designer | Wawrzyniec Lewandowski |
| Designed | 1938 |
| Manufacturer | Państwowa Fabryka Karabinów |
| Unit cost | zl30,000 (tank version) |
| Produced | 1938–1939 |
| No. built | 55 |
| Specifications | |
| Mass | 57.6 kilograms (127 lb) |
| Length | 2,015 millimetres (79.3 in) |
| Barrel length | 1,476 millimetres (58.1 in) |
| Width | 202.5 millimetres (7.97 in) |
| Crew | 3 (PL 20A mount)/ 6 (PL 20B mount) |
| Shell | 20x138mmB |
| Shell weight | 320g |
| Caliber | 20 mm |
| Action | blowback |
| Rate of fire | 320-350 rpm |
| Muzzle velocity | 856 metres per second (2,810 ft/s) |
| Effective firing range | 5,000 metres (5,500 yd)/7,000 metres (7,700 yd) |
| Feed system | box(5/10 rounds)/drum(15/100 rounds) |
The nkm wz. 38 FK (Polish military acronym meaning heaviest machine gun pattern 1938) was a 20 mm heavy machine gun (autocannon by modern terminology) produced in inter-war Poland. It was used both in anti-air and anti-tank role and was also adapted for tank use and mounted on some TKS tankettes. Mass-produced since 1938, it was used extensively during the Polish Defensive War of 1939.