5 cm KwK 38
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The 5 cm KwK 38 L/42 was a German 50 mm calibre cannon used as the main armament of variants of the German Sd.Kfz. 141 Panzerkampfwagen III medium tank during the Second World War. Wikipedia
Barrel length: 210 cm (83 in) bore (42 calibers)
Caliber: 50 mm (1.97 in)
Muzzle velocity: 685 m/s (2,250 ft/s)
Shell: Fixed ammunition 50 mm × 289 mm (2.0 in × 11.4 in) R
Unit cost: 8,000 RM
Used by: Nazi Germany