Otobreda 127/64
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The OTO 127/64 LW Gun assembly is a rapid-fire gun mount suitable for installation on large and medium size ships. It also has a version for coastal defense, intended for surface fire and naval gunfire support as main role and anti-aircraft fire... Wikipedia
Barrel length: 320 in (8.1 m)
Caliber: 127 mm (5.0 in)
Effective firing range: 30 km (19 mi) VULCANO: 70–120 km (43–75 mi)
Mass: Empty: 33 t (73,000 lb)
Maximum firing range: 120 km (75 mi)
Muzzle velocity: 808 m/s (2,650 ft/s)
Place of origin: Italy