42 cm Gamma howitzer
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The 42 cm kurze Marinekanone L/12, or Gamma-Gerät, was a German siege gun built by Krupp. The Gamma-Gerät's barrel diameter was 42 cm, making it one of the largest artillery pieces ever fielded. The Gamma-Gerät began development in 1906 and... Wikipedia
Barrel length: 6.7 m (22 ft) L/16
Mass: 150 t (150 long tons)
Maximum firing range: 14,200 m (46,600 ft)
Used by: German Empire; Nazi Germany