| Otobreda 127mm/54C | |
| Calibre: | 127 mm (5 inch) |
| Mass of the system: | 37500 kg (without ammunition) |
| Magazine: | 66 (ready to fire in three drums) |
| Mass of one round: | 888 mm length shell: 15.44 kg 665 mm length shell: 31.75 kg |
| Elevation: | Minimum -15° Maximum +83° |
| Range: | ±30000 m (100 km with guided VOLCANO ammunition) |
| Turning limitation: | 165° port and starboard (330° total) |
| Rotation speed: | 40°/s (with acceleration of 45°/s2) |
| Elevation speed: | 30°/s (with acceleration of 40°/s2) |
| Cooling: | sea water - fresh water for flushing |
| Rate of fire: | 40 rds/min |
| Electrical Power supply | 440V, 3-phase, 60 Hz (275kVA - 20% max peak power for 0.4 sec) |
The Otobreda 127mm/54 Compact (127/54C) gun is a naval artillery piece built by the Italian company Oto Melara. The gun is completely new but uses the same semi fixed ammunition as the American 5 inch/ 54 gun. It was introduced into service in 1968. A new advanced lightweight mounting for corvettes has been developed. The barrel is water-cooled. Currently the Otobreda 127/64 with a longer range and less weight is being developed. This new model will first be mounted on German and Italian warships.
The Otobreda 127/54 Compact and 127/54 Lightweight are used on the following ships:
Also, the Otobreda 127/54 was used on the Canadian Iroquois class destroyers prior to their TRUMP refits in the early 1990s, when they were replaced with the Otobreda 76 mm naval gun.